The last gas-lit cinema in the United Kingdom, and perhaps the world.

Relive a Polish uprising via an enormous, century-old cyclorama.

A collection of old neon signs from all over Poland line a secluded courtyard.

This ex-prison dates back to the Middle Ages.

One of the world's largest amber altarpieces is housed within this reconstructed medieval church.

The smallest chapel in Europe is a moving testament to the love between a husband and wife.

A wooden prison doesn't sound like a good idea, yet this abandoned 1950s detention center still stands today.

The history of those incarcerated in Singapore during World War II is etched into the bricks of a popular staircase.

The site of the notorious Camp Sumter Prison is now a peaceful memorial.

A bronze replica of an elm tree that honors the victims that perished in Pawaik Prison.

At night, this memorial illuminates a ghostly outline of a footbridge that connected two sections of the Warsaw Ghetto.

An artificial date palm stands as a memorial to Warsaw's Jewish community.

An enormous, interactive museum with star-studded exhibits is surprisingly found deep in the Mississippi Delta.

A gorgeous, nostalgic café housed in a lofty old warehouse, lit only by petroleum lamps.

A small museum celebrating the work of a Mississippi artist who had a unique connection with the natural world.

The first successful human heart transplant is depicted through wax figures at the hospital where it the surgery took place.

An underground world of gorgeous, palatial metro stations designed as a nuclear shelter complex.

Collected from all around Seoul, thousands of secondhand books create this photogenic tunnel.

The largest cluster of the Joseon dynasty’s royal tombs, home to the burial sites of 17 kings and queens.

The early 20th-century home features cutting-edge technology of the day, such as ammonia refrigeration and needle showers.

Buenos Aires' city of the dead contains some very famous remains, including Eva Perón.

This historic, palatial theater is now one of the world’s most beautiful bookstores.

An art installation commemorates journalist Nellie Bly's undercover reporting inside a New York asylum.

A monument to an Irish secret society thought to be responsible for a string of violent attacks in Pennsylvania coal mines.