Think back to the last concert you saw, and ask yourself what it looked like. Do visions of black-painted walls, flashing lights, and overcrowded bars come to mind? Perhaps there were a few chandeliers hanging from the ceiling, or maybe a red velvet curtain framing the stage; but otherwise, the space was probably unremarkable and easy to forget.

But what if that same concert were held in a boxing gym, on a moving train, or at the top of a ski jump? It sounds unlikely, or perhaps too good to be true, but these spaces have actually functioned as concert locations for secret pop-up shows organized by a company called Sofar Sounds. To date, they've hosted gigs in over 390 cities around the globe in unconventional locales, exposing up-and-coming musical acts to new fans. Sofar first began hosting intimate shows in private homes some ten years back, when they realized that all the trappings of a traditional concert tended to take the focus away from the music itself. So in 2009, founders Rafe Offer and Rocky Start invited a small group of friends over to their London flat to gather on the floor, share a drink, and enjoy a live performance; thus, Sofar Sounds was born. They began by hosting shows in living rooms and backyards, but quickly expanded to storefronts, beaches, attics, offices, and just about any place that could hold a crowd. Today, they put on intimate and exciting shows seven nights a week in cities all across the globe, only revealing the location to guests the day before and the night's lineup as they walk in the door. Ahead, AD rounds up some of the coolest spots around the world where you just might catch a show.

1. Top of the Holmenkollen Ski Jump (Oslo, Norway)

Holmenkollen ski jump is one of the most noted ski spots in all of Norway, and on not one but two separate occasions the local Sofar team successfully shifted three bands, their equipment, and the audience up the ski lift for shows with a spectacular view of the city.

2. Gaudi’s Casa Batlló Rooftop (Barcelona, Spain)

Celebrated Catalan architect Antoni Gaudí's Casa Batlló rooftop played host to a benefit show organized by Amnesty International and Sofar that supported refugees worldwide, inviting the audience up to experience the modernist creation in a unique way.

3. Trampoline Park (Odense, Denmark)

Most of the show went on as per usual: a small crowd, floor seating, BYOB, and respectful silence during each band. But in between each set, the crowd went wild playing on the trampolines; by the end of the night there were three sprained ankles, but the injured said the stories were absolutely worth it.

4. Lakefront Sauna (Lund, Sweden)

This past summer a Sofar audience in southern Sweden watched a show on the moss-covered rooftop of a sauna before heading inside for a relaxing, post-show steam.

5. A moving tram (Wroclaw, Poland)

This Sofar took the show on the road (quite literally), with a 50-year-old tram beginning at one end of the city and moving through the streets as the bands played. It made stops in between each set for the artists to swap out, and passersby were invited on board to enjoy the music. On the journey back, all three bands played together for a rousing finale.

6. Willis Tower (Chicago, USA)

Chicago is known for its modern architecture, and what better location to hold a concert than atop the Willis Tower, the city's tallest skyscraper, as the sun set in the distance.

7. Cinecittà Studios (Rome, Italy)

Cinecitt`a is the largest film studio in all of Europe, and has seen the production of many classic films and series including Passion of the Christ, La Dolce Vita, The Life Aquatic, The Young Pope, and more. During an Amnesty International x Sofar Sounds benefit show, the bands performed in front of a statue featured in the iconic chariot run scene from Charlton Heston's Ben Hur.

8. Bumbershoot Aerial Arts Studio (St. Louis, USA)

St. Louis's Sofar team held a show at an acrobatics studio for a night that celebrated art in all forms. Dancers spun through the air as the acts played below; one of the artists of the night even gave it a go, and played her viola while hanging upside down.

9. Total Boxer Gym (London, UK)

Hosted in North London's best boxing gym, this Sofar show placed the stage in the center of the ring while the audience cheered on the artists from the stands.

10. Handel & Hendrix (London, UK)

What better venue for a Sofar show than Handel & Hendrix, a museum that celebrates the musicians George Handel and Jimi Hendrix. The two lived in homes next door to one another, almost 200 years apart, and above, the audience got to hang out in Hendrix's bedroom after the show.

11. United Palace Theatre (NYC, USA)

Dating back to the 1930s, Upper Manhattan's Palace Theatre is one of the great Wonder theaters designed by Thomas Lamb. It has since ceased operation as a movie theater, but has become a favorite venue for the New York Sofar team.

12. Graveyard of the Gloria Dei Episcopal Church (Philadelphia, USA)

Philadelphia's Sofar team found the spookiest venue for a Friday-the-13th show: the graveyard of the city's oldest church. The cemetery holds burial and memorial sites of notable Revolutionary and Civil War officers, and its accompanying church is the second oldest Swedish church in America.

13. Carriage house converted to private residence (St. Louis, USA)

This private residence in St. Louis is owned by the grandson of one of the city's greatest mayors, Raymond Tucker. Once a carriage house, it has since been converted into a home that was the perfect location for an intimate Sofar show.

14. Garfield Park Conservatory (Chicago, USA)

Chicago's Garfield Park Conservatory, founded by Jens Jensen, is one of the largest of its kind in the country. At this show, the audience got to enjoy both the music and the surrounding foliage, which is often referred to as "landscape art under glass."

15. Dream Park-Zouk (Beirut, Lebanon)

Surrounded by lush trees, thrill rides, and the warm Lebanese air, this Sofar show took place in one of the Middle East's largest amusement parks.

16. The Kreeger Museum (Washington, D.C., USA)

Designed by the renowned Phillip Johnson, the architecturally stunning Kreeger Museum welcomed the D.C. Sofar team for a night of music among their robust collection of paintings, sculptures, prints, and more.