The land is home to swimming ponies and a legendary 18th-century treasure.

The world's longest known cave system.

The tabby ruin is Savannah’s oldest surviving structure.

The first public building in Savannah to offer air conditioning was a luxurious cinema that still operates today.

An early-19th-century hotel with a past that is steeped in the Civil War.

One of Savannah's oldest and most haunted cemeteries, featuring graves desecrated by Sherman's Union Army.

A dazzling work by a Pop art legend hangs in one of the world’s busiest subway stations.

An historic and oft-filmed spot for musclebound iron pumpers on the Pacific coast.

The blinking light atop the iconic landmark has been sending secret messages for decades.

World-famous, Pink's still manages to keep its prized cult fetish status.

This striking church was built from a Frank Lloyd Wright design more than a decade after the master architect's death.

This once-booming Gold Rush town is now home to a herd of feral donkeys.

The world's only teal arches exist in a city that cares more about its aesthetic than an Instagram influencer.

A spiritual vortex among the red rocks in Sedona.

A reproduction of earth's many biomes.

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

Buy your fish and have it cooked to order in this bustling, eight-floor seafood market.

This colorful gate stands as an entrance to the walled city of Old San Juan.

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

Deep into the lower floors of Pike Place, find a date with fowl fate.

Though strikingly beautiful, Seattle's other railway station is now largely forgotten.

A colorful architectural gem in Seattle’s uniquely modern Central Library.

Couple's personal collection of pinball machines turned public pinball museum.

A daily replay of the experiment that proved the rotation of the Earth.