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

This kaleidoscopic mural shows Bob Dylan throughout his transition from young troubadour to Nobel laureate.

Once close to extinction, there is no shortage of elephant seals on the beaches of Año Nuevo State Park.

A New England-style lighthouse along California's beautiful Highway 1 gets a re-do.

Another of California's unused Cold War missile defense complexes has become a graffiti gallery.

An eccentric priest's tribute to George Washington, this chapel tells the story of the American Revolution.

Experience the hysteria of a 17th century witch hunt through goofy reenactments and wax dummies that should probably be burned at the stake.

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

In 1958, an MIT fraternity pledge laid down on this bridge and instituted a new, unique unit of measurement.

This supermarket is suspended 25 feet above an interstate highway.

Accessible only by boat, this centuries-old island fort never saw troops or combat.

Spanish architects used seized Muslim gravestones to rebuild parts of the fortress.

At this faithfully preserved medina off the Moroccan tourist circuit you can walk through six centuries of history in one day.

Spanning the El Chorro gorge, this pathway used to be one of the most dangerous crossings in the world.

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

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.

The hidden ruins of an old hydroelectric plant reclaimed by nature.

Spain's stunning solar energy plant.

The Roman city was the birthplace of various emperors and is home to one of the empire's most impressive architectural feats.

A church of bones, decorated with 40,000 human skeletons.

An enormous and lavish Gothic church in Czechia.

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

The remains of a community that was forced to move for a dam that never materialized still rot in this Pennsylvania park.

On top of a sheet metal business in Juneau stand nearly a dozen charming Wizard of Oz statues.