A beautiful 19th-century Armenian mansion is preserved above an unassuming cafe.

The legendary luxury train passage is commemorated with a charming museum inside its former eastern terminus.

This museum was invented in a novel before being made real by the author.

1513 Turkish world map, full of European state secrets and snarky commentary.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

Ottoman-era houses lovingly preserved.

The steepest classic funicular in the world glides along a dizzying incline.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

This amazing pedestrian suspension bridge in the Swiss Alps would give Indiana Jones nightmares.

The bizarre visions of H.R. Giger, tucked away in a Swiss medieval city.

A Swiss amusement park entirely dedicated to the theory of ancient astronauts.

This long line of cement defensive wedges is named after the famous chocolate bar for obvious reasons.

Artworks by loners, prisoners and the criminally insane.

Museum of science fiction, utopias, and extraordinary journeys of the mind.

A Swiss board game museum housed inside a picture-perfect castle.

A cablecar-station-turned-revolving restaurant with 360-degree views of the Swiss skyline.

World's largest permanent maze made of 18,000 conifers.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.