A whale rib was used to advertise the store by the arch that offered exotic goods from far away.

A section of the long chain that blocked enemy ships from entering Constantinople.

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

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

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

Most-visited and most-photographed slot canyon in the American Southwest.

A sharp bend in a dramatic river canyon cut through red rocks.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

Pilgrimage site for star-crossed lovers.

A diverse collection of wax, bone, papier-maché and mummified relics.

2300-year-old Roman road connecting the empire.

The only surviving choragic monument is a trophy awarded in 334 BC for the winning dramatic chorus.

The mystic whose incorrupt corpse still attracts the faithful.

The underground sanctuary of a mysterious ancient cult.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A curious carving hides on a marble column in the Mosque-Cathedral of Córdoba.

The world's largest wooden structure.

The effect of this ancient form of image projection situated atop an 11th century Moorish palace is thrilling.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Rare karst landscape eroded from a flat seabed.

Immortalized by artists, this church incorporates a medieval lighthouse into its shoreside structure.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

The site of the first medieval crusade that pitted Christians against Christians.

Historic medieval fortified city in southwest France.