An ancient Roman temple first dedicated to an emperor's wife is now a church.

A magnificent waterfall nestled in the heart of the El Yunque National Forest.

This tiny home was originally a narrow alleyway.

This staircase in a lush tropical grotto was built by enslaved laborers and renamed to honor Queen Victoria's role in ending slavery in the British Empire.

This giant temperature attraction created some giant electric bills.

The drama of nature in full effect in this Nevada State Park.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

Formerly the world's largest, this Willy Wonka-esque contraption runs 24/7.

An exotic wildlife habitat right off The Strip.

Golden Gate Park's historic collection of plants.

Once the largest windmill outside of Holland, with enormous 114 foot sails.

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

The key to turning shifting dunes into the green oasis of Golden Gate Park.

An artsy hidden staircase leads to breathtaking views of San Francisco.

Dozens of large, brightly-colored paintings adorn the walls of the "street art capital of Iceland."

If a glacial river suddenly diving into a sheer chasm via a dramatic, multi-stage waterfall isn't peak Iceland, it's certainly close.

This valley of hot springs and boiling mud pots is home to the record-holding "Geysir," which originated the English word.

Medicinal spa created with the discharge from a geothermal energy plant.

Walk in the footsteps of the gods and straddle two tectonic plates.

This fantastical waterfall is hidden in a cave located in a cracked cliff.

A wall of chewing gum moonlights as collective art.

A museum dedicated to the history and exploration of both popular music and science fiction.

A sliver of nostalgia in Seattle's Viretta Park.