This sculpture of a bowler hat is complemented by a matching umbrella a few blocks away.

The bridge continues the legacy of President Franklin D. Roosevelt's New Deal policy.

A tribute to the little-known group of women who were the first ever to fly aircraft in the U.S. military.

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

The Grand Canyon of Texas.

This Texas windmill field celebrates the power and majesty of the very winds that blow.

A wacky, UFO-shaped house in a suburban neighborhood.

A cave's rare beauty held a cavernous secret hidden underground.

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

The symbol was surreptitiously built into the river bank by German prisoners of war.

A museum dedicated to the alleged Roswell Incident.

This Costa Rican chapel is the most metal church in the world, literally.

The same water that fills a luxury resort’s pools feeds these free hot springs in the rainforest.

This spot along the 23.5 degree north parallel marks the northern boundary of the tropics.

A graceful natural rock formation stands astride the point where the Gulf of California meets the Pacific Ocean.

A collection of massive stacked rocks in Texas includes a snarky note on the benefits of modern technology.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

Considered the birthplace of the Copper Age and Bronze Age, the river is tinted red from 5,000 years of mining.

Portugal's National Pantheon has a history of curses, collapses and financial problems.

This tile-work piece featuring a chicken riding in carriage is both a remarkable artistic creation and a social commentary of politics and culture in 17th-century Portugal.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.