This glamorous old building is said to have inspired the Tower of Terror.

When ecosystems collide in the arid Southwest.

This Big Sur waterfall drops 80 feet directly into the Pacific Ocean, and inspired the hillside house up top.

This maze-like slot canyon is a unique gem within an already fascinating geological area.

Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

The highest bridge in America was built for an almost unnervingly small amount of money.

The longest navigable underground river in the United States is home to countless blind and albino animals.

Rare recess caves fill this unbelievably beautiful Ohio park.

European castle ruins in an American state park are actually the product of death and grief.

An abandoned relic of the city's failed experiment with below ground transit.

Trails through lava-carved tube-caves display sparkling bacteria and a rich history.

A bizarre roadside attraction and the first instance of miniature golf in the world.

A particularly creepy abandoned hospital that sparks interest for lovers of the supernatural.

A three-story copper skybridge connects two Manhattan buildings with Art Deco luxury.

Hidden in an ordinary Midtown building is a one-room museum dedicated to the greatest escape artist.

One of the most scenic stretches of road in America winds between some of the country's oldest trees.

See massive fossils that are over 200 million years old in northeastern Arizona.

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

A whimsical village of unique treehouses resides in a Washington forest.

An abandoned stretch of highway, deteriorating next to the operational one.

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

These eerie outliers of the lightning bug family glow a mysterious blue color.

Oregon's unexpected high desert, displaying layers of time in a colorful show.

Quite simply the largest tree in the world (by volume).