Places colingross Wants to Go

A miniature train-ride through Slovenia's largest cave system.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

This one-time health resort was used by aristocrats around the world.

This massive subterranean fissure is known as the "underground Grand Canyon."

Hundreds of boat-shaped headstones fill this graveyard as part of a centuries-old custom with mysterious origins.

The remains of an entire Roman city can be explored in this interactive museum.

Central Europe's largest collection of mini-bottles is on display at this museum devoted to a bitter Hungarian liquor.

Budapest's Communist-era statues, banished to the suburbs.

A museum in the childhood house of a medical pioneer.

A Hungarian pharmacy museum with a box full of mummy powder.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

A wunderkammer of mysterious objects and stories.

A fascinating insight into daily life in the Eastern Bloc.

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

Do these monsters look familiar? The gargoyles on this church are all from pop culture.

The castle still holds traces of the abandoned Roman fort it was built atop.

An abandoned quarrying village turned commune is now a hub for learning the Welsh language.

An unexpectedly extraterrestrial room in a former Victorian resort club.

Mysterious chains and iron stakes adorn this strange grave, with no explanation.

An unsanctioned shrine that sprung up outside the late singer's home is causing a stir in London's Highgate neighborhood.

This tin chapel was built by POW's during World War II and is painted to look like something much more grand.

A small village in two different countries.

This studio was home to David Bowie's first single, even if it did turn away the Beatles.