A Barbary Coast watering hole built into a Gold Rush shipwreck.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

San Francisco's newly reopened hands-on science museum.

Tiki luxury on Nob Hill.

Olfactory delights in San Francisco's Botanical Gardens.

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

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

A huge musical instrument played by the ocean.

The world's largest occupied bat houses hold hundreds of thousands of flying mammals.

In Florida, these naughty monkeys live on their own mini-monkey Alcatraz.

This Mississippi seminary was the first in America to train Black Catholic priests.

Orr Park's dead trees have been carved into a menagerie of whimsical visages.

Meet manatees face-to-face at this zoo for native species.

This roadside attraction in the woods of Mississippi is a scalable replica of the Holy Lands during biblical times.

Built following the War of 1812, this fort has withstood hurricanes for centuries.

A peaceful, unique botanical garden complete with waterfalls, mini islands, and swans.

One of the largest-ever mental hospitals now sits abandoned, surrounded by 25,000 unmarked graves.

The picturesque southern city served as the zombie-filled town of Woodbury in 'The Walking Dead.'

The abandoned bathhouse is all that remains of the hot springs considered Florida's original tourist attraction.

This botanical garden has been nicknamed "Alabama's Little Corner of Greece."

The site of the notorious Camp Sumter Prison is now a peaceful memorial.