Hundreds of pieces of ancient Taíno art cover the walls of this Caribbean cave system.

The Cambridge pub where Francis Crick announced that he and James Watson had discovered the DNA double-helix.

Local legend says Isaac Newton built this footbridge without any screws, bolts, or nails.

Taking the subway here means doing so over a bridge located in the middle of an estuary.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

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

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

A marvel of Byzantine engineering under the streets of Istanbul.

A fountain standing as a testament to a doomed alliance.

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

A sixth-century Byzantine cistern hidden below a modern carpet store.

The final resting place of soldiers' loyal canine companions.

A six-ton wedding present for the King of the Scots.

A 18th century graveyard and its astonishing cortege of macabre iconography.

Dead weights honor the dead of Portugal's fishing industry.

The iconic boulevard is the perfect place to catch sight of a bicycling skeleton, a levitating Satan, or a chef with his head stuck in a pizza.

Barça football fans might see the insignia hidden in a church window as a divine sign.

Giant eggs, walls of bread, and nightmare surreality mark the largest collection of works by Salvador Dalí.

This enormous censer uses a pulley system installed over 400 years ago.

Come for the bread-themed puppet show, stay for the buffet.

A glacial valley filled with silver beech trees in the mountains of Portugal.

A small sanctuary carved into the mountainside near the tallest point in continental Portugal.

This tower once served as a radar station during the Cold War.

Panoramic views from the mountains over a facility built to provide tuberculosis patients with fresh mountain air.