The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

Las Vegas's very own 40-foot-tall fire-spewing praying mantis.

Beneath a Virginia City bar is the entrance to an abandoned gold mine.

This Nevada lake holds its titular natural pyramid and, if the legends are true, a number of dangerous spirits.

A mining town once rife with murderous disputes over its copious treasures now creates income as a popular spot for photo shoots.

This famous Nevada gold mine, once a hotbed of Wild West shenanigans, is now open for tours.

Thousands of glyphs created by an unknown culture decorate the rock formations of this canyon.

One of the most enjoyable bits of history at Coney Island and “the most romantic ride in the world.”

The stone walls of a home built to withstand a California wildfire still stand after more than a century.

This park is home to California's first oil boomtown, with structures that have stood for more than a century.

Home to secret Eastern Bloc spy equipment and the largest stretch of the original Berlin Wall outside of Germany.

Known as the "Hobbit Houses," these storybook homes look like they're straight out of the Shire.

This forgotten Frank Lloyd Wright house is an architectural marvel at the end of a sleepy residential street.

This weird abode has inspired everything from the "House On Haunted Hil" to a robot hunter's pad.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

A castle that was built stone by stone by an eccentric journalist.

In the middle of a remote desert town is a surprisingly opulent hotel.

This centerpiece of the Hollywood & Highland shopping center is a recreation of a long-lost movie set.

"The greatest unknown literary treasure in Los Angeles."

Gorgeous purple flowers drape from the world's largest blossoming plant.

The awe-inspiring ship from the golden era of cruising has an incomparable history and a reputation as one of the world’s most haunted places.

One of the largest helium balloons in the U.S. is a 112-foot ginormous orange.

This enormous World War II relic is one of the largest wooden structures in the world.

The site of an underground detonation of a megaton nuclear bomb in the middle of the Mojave Desert.