A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

A 140-year-old castle with underground caves hidden in San Francisco.

An artsy hidden staircase leads to breathtaking views of San Francisco.

This former lieutenant governor's home is brimming with curiosities.

Decades' worth of lost and forgotten objects make up the collection of this tantalizingly odd little museum.

A homage to the King at the hotel where he revived his career.

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

This vintage animatronics show is the Vegas version of a walk through the woods.

An exotic wildlife habitat right off The Strip.

Nevada's largest cactus collection stands outside a candy mogul's small factory.

Originally built as a promotional giveaway, this suburban house was designed to be an IRL version of the Simpson home.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

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

A huge musical instrument played by the ocean.

For thousands of years, Native American hunters drove buffalo straight off this cliff in Montana's Yellowstone Country.

An apocalyptic seismic event creates a deadly chain reaction that ends with a 6-mile long lake developing within weeks.

A rapidly disappearing glacier filled with extinct grasshoppers, perfectly preserved in the ice.

This beautiful ancient site is dotted with perforated sandstone pillars considered sacred by some Native American groups.

The rocks of a certain area of Butte, Montana give off a musical ring when hit.

This combination shop and museum is filled with curious items and artifacts.

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

This set of hot springs also comes with fantastic views.

This museum glorifies the humble potato.

Sweet Willy, at 30 feet tall, is the world's biggest beagle.