Golden Gate Park's historic collection of plants.

This sacred cavern, 400 feet deep, is home to millions of bats and an ancient burial ground.

In which a local geological marvel becomes a quaint roadside attraction.

Chicago's museum dedicated to the history of bondage and fetishism is more textbook than titillation.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

The highest point in Virginia can only be reached by passing through ponies and flowers.

Years of archaeology, just chillin' by the water cooler.

Housed in a century-old building, this museum's dedicated not just to soft drinks, but to the free enterprise system.

The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

These banned cigarette vending machines now sell little pieces of pocket-sized art.

Silver in the hills led to the speedy creation of this boom town and a lack of it saw the town abandoned nearly as quickly.

Every day a troupe of pampered water fowl walk the red carpet to their favorite fountain.

A former utopian healing center created by a huckster and built by derelicts.

An institution that preserves the history of institutionalization.

A quiet and contemplative oasis in the middle of New York's bustle and riot.

This cave holds a surprisingly colorful variety of geological oddities.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

Hell on Earth is actually a small town in Michigan where anyone can be mayor for a day.

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

Lie in a hammock where George Washington stood.

This Philly cemetery is the eternal home of many famous area residents, including Rocky Balboa's wife.

A gleaming white tower in ornate Indian style soars above the low-slung bungalows of north Tampa.

A train station that was abandoned by the coal industry and was later converted into a cocktail bar.

Over 100 concrete munitions bunkers are all that remain of a Pennsylvanian village seized by the US government.