Spain's largest bullring offers a unique glimpse at architecture and history.

These unique volcanic rock formations offer the perfect opportunity to camp and hike.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

The ruins of an ancient stadium that hosted gripping chariot and horse races.

A curious memento mori hangs in the magnificent Cathedral of Segovia.

This line of 12 tower mills described in the story of Don Quixote is among the most iconic landscapes in Spain.

This magnificent castle grew from a small Moorish fortress, and reportedly inspired two iconic Disney castles.

The world's largest wooden structure.

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

The oldest giants in Catalonia are now displayed in a 14th-century Gothic church.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

The second largest roadrunner in the world stands 11 feet tall in his West Texas town.

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

A recreated Stonehenge stands in a country field, complete with Easter Island moai heads standing as sentries.

Site of the greatest known waterfall that ever existed.

The state's only comprehensive museum dedicated to the mineral that defined its history and economy.

A spring-fed pool so deep it's used for scuba diving as well as swimming.

This 19th century mansion façade adorned with immigrant patriotism is a symbol of Louisville’s history.

Still standing despite its considerable slant, this tilted lighthouse has become a local symbol of resilience.

America's only nuclear missile silo open to the public.

A stone pillar commemorates the surrender of the extraordinary Apache leader.

This rural museum is home to more than 50 local desert reptiles and the world's largest snake bite kit collection.

The former home of the army detachment that captured Geronimo.

This fireplace-turned-monument pays tribute to the assassinated U.S. president.