Four-story concrete hotel never opened to customers.

Colorful boxes placed over the dead are left to rot and crumble.

The king of U.S. high points towers over every other peak on the continent.

This whimsical stacked cabin looks like something out of a children's book.

Yes, this monument is aware that it is about 20 miles away from the actual center of the United States.

Around half a million years ago, these magnificent columnar basalt cliffs were formed from cooling lava.

The world's longest known cave system.

This awkward aquarium sculpture is one of the strangest statues in Chicago.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

Seattle's own bad art museum located inside Cafe Racer.

Northern Ireland's Brobdingnagian stepping stones.

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

This grand gothic brewery has been pumping out suds for over a hundred years.

The magic's in the hole!

The fountain marks the area where hundreds of accused witches were burned at the stake.

A museum dedicated to the alleged Roswell Incident.

The atmospheric road was never meant to be so creepy.

Ruined 11th century abbey built by King David I in Edinburgh, Scotland.

360° views of the city plus five floors of optical illusions and hands-on science.

A heavenly experience, right here on Terra Firma.

This frequently-photographed waterfall takes only a short hike to visit.

Home to items never before seen by the public.

This 17th-century street hidden beneath Edinburgh was once a breeding ground for the black death.

A beautiful 62-acre Catholic shrine and botanical garden.