One day a year it is legal to jump off of this astoundingly tall bridge that spans an Appalachian gorge.

This elaborate towering structure was once famed for its revolutionary height.

Meet your friends, marry your true love, or tell your enemies to kiss your butt under this historic Pittsburgh timepiece.

The only way to see Pittsburgh is from the top of this lookout point, just like the ancient members of the native peoples did.

A world-class observatory in the California desert.

Megachurch turned Catholic church comprised of 10,000 glass panes.

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

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The sci-fi villain is a little-known inhabitant of the U.S. capital's largest cathedral.

Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

This picturesque cliffside beacon no longer calls to sailors but shines once a year in honor of a famous shipwreck.

This posh mansion began as a family's estate and ended as the site of a murder ripped from the pages of a pulp novel.

Home to the Amorphophallus titanum "Corpse Flower," which is among the largest flowers in the world and also smells powerfully of rotting flesh when in bloom.