The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

A unique opportunity to stay the night in retrofitted sections of sewer pipe.

Vienna's underworld of tunnels and subterranean rivers made an iconic appearance in a 1949 Orson Welles film.

Guests become prisoners on a visit to Latvian prison.

A top secret Cold War bunker hidden beneath a Latvian spa facility is now open for tours.

A former Latvian headquarters of the brutal KGB secret police is now open as a grim reminder of their atrocities.

Featured in one of the most iconic scenes in cinema history.

Get past the gatekeeper's apartment and enter an elaborate hoax of a restaurant with a Masonic feel.

Ancient mysterious ruts carved in the bedrock.

The “Sistine Chapel” of the Middle Ages merges 11th-century science and religion in wondrous hues.

Small on the outside, big on the inside, this church is an astonishing act of visual deception.

A lover's walk between hilltop towns, decorated with graffiti love notes.

A young Italian couple has been locked in an embrace for over 6,000 years.