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

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

The massive, incredibly rare instrument is over 11 feet tall with a range so deep it goes lower than humans can hear.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

An urban laboratory.

A spiritual vortex among the red rocks in Sedona.

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

This little Greek plateau is home to thousands of rustic, white-sailed windmills.

The oldest olive tree in Greece has been bearing fruit for at least 2,000 years.

According to myth, Zeus himself was hidden in this cave to escape being eaten by his dad.