In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

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

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

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

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

A huge musical instrument played by the ocean.

This Wyoming town is fascinated by a particular mythical creature.

Population: 1.

The highest point in Wisconsin is capped by two towers that are not as mythic as Tolkien's but provide much better views.

One of the smallest towns in the United States.

The first declared National Monument in the United States.

A trailblazing sovereign nation tucked in the American state of Wisconsin.

Despite its lavish ornamentation, and wholesome lifestyle of its devotees, this mountain commune has faced its share of issues.

Restaurant in Northern Wisconsin comes with a unique feature: a grassy roof covered in living goats.

A bizarre house filled with an astounding array of collections.

The center of the only hemisphere that awards visitors with a commemorative coin.

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

Once connected to the outside world by a single train track, this ghost town is looked after by the National Park Service.

Spanning an elevation of 160 feet and containing 388 steps, this is Seattle's longest staircase.

A busy cafe better known for board games than food.

This scenic gorge is named after one of the most famous Bigfoot attacks in pseudohistory.

Native American burial mounds? Giant gopher dens? No one knows what created the Mima Mounds.

A whimsical village of unique treehouses resides in a Washington forest.