One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

The first declared National Monument in the United States.

A fortified city, home to a remaining population of five families

Mosaics, storks, and brothels—this ancient city has it all.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

Thousands of narrow alleyways in an ancient medieval city make up what's believed to be the world's largest car-free urban zone.

An abandoned lighthouse awaits its destiny: being buried under shifting sand.

This legendary urban waterfall creates a dazzling display of rainbows.

Romania's "Red Ravine" is a little-known natural wonder that bears a resemblance to the Grand Canyon.

A sharp sculpture made of thousands of pieces of jagged glass.

This Dutch Colonial home is the oldest remaining farmhouse in Manhattan.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

An eclectic assortment of medieval architecture in a small Iowa town.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

This stately building in Alexandria, Virginia was built by Freemasons to honor one of their most famous members.

This imposing Masonic temple a mile from the White House was the first public library in Washington, D.C.

Mortarless walls that stretch for miles are a lovely solution for creating grazing land in the harsh terrain of the Aran Islands.

A hugely vast Irish landscape of barren rock that stretches for miles.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

An Iron Age fort on the edge of a seaside cliff offers a glimpse into an ancient, mystical world.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

On the Pakistan-India border the militaries perform an elaborate theater of aggression each and every night.

The picturesque birthplace of Icelandic democracy is drenched in the blood of its brutal past.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.