These 12th-century catacombs carved into a mountainside were a place of mysticism and Christian hermitages.

A small marionette collection located within the dark cellars of an 11th-century Austrian castle.

The medieval network of canals hidden underneath the city is opened to explorers each year.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

The once highest point in China blends symbolic design with a kick of adrenaline.

This skeleton-filled altar piece served as a backdrop to one of the most iconic scenes in "The Sound of Music."

The townhouse where the "Blood Countess" Elizabeth Báthory started her murderous career.

Legends surround an ancient tree trunk riddled with nails for good luck.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

In the fictional world of Kcymaerxthaere, standing at this site just outside Vienna, Austria, the sky would have been found beneath your feet.

This grand manse has been transformed into a museum devoted to one of the founders of Fantastic Realism.

A once-fairy tale mansion now stands in a state of disrepair.

A plaque bearing the names of those who dedicated themselves to protecting Budapest's Jewish population during World War II.

This building has survived for more than a century and remains virtually untouched.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

A statue in Budapest's Liberty Square honors the former U.S. president's efforts to end the Cold War.

This easily overlooked memorial immortalizes the scars from the 1956 Hungarian Revolution.

Museum dedicated to the terror regimes of Hungary.

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

This statue of a falling man commemorates a teenage martyr of the Hungarian Revolution.

The Hungarian biochemist whose research helped develop mRNA-based vaccines for Covid-19.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.