Roman ruins top white travertine terraces formed by ancient hot springs.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

A fountain standing as a testament to a doomed alliance.

Ancient serpentine sacrifice holder that has stood the test of time.

This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

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

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

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

A marvel of Byzantine engineering under the streets of Istanbul.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Revel in the Victorian splendor of the world's oldest eating establishment inside a museum.

A naturally mummified 2,000-year-old man.

The mirrored section takes the shape of Hebrew characters when viewed from above.

A rare tour of an aristocrat's private home reveals valuable 17th-century paintings from artists like Rembrandt.

The attic of a four-century-old canal house hides a clandestine church.

This gorgeous reading room houses the oldest and largest art history library in the Netherlands.

Established in 1638 to battle the Black Death, this botanical garden is a treasure trove of rare flora.

Museum preserving torture methods from the past.

Go inside to really appreciate this 500-year-old technological masterpiece.

A trough of 700 strange bronze faces runs through a narrow alley in Ljubljana's old town.

A whimsical bridge adorned with decorative dragons.

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

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.