Hollywood's most famous landmark, the "temporary" sign that has stood for decades longer than intended.

This abandoned amusement park was built on a site with a dark history.

Its buzzing collection honors vibrator history.

This strange seaside tower got its name from a wealthy eccentric who would hide coins among its stones.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

The deepest lake in the United States, and once the site of epic destruction that lives on in legends.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

This shop for all your super spy needs hides an educational secret.

A semi-scholarly approach to sex.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

Eighteen miniature death-scene dioramas.

The seamy, underground secrets of Portland's criminal past.

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

The old Niles Canyon Aqueduct in the San Francisco Bay Area is a bemusing and secret trail through nature for wayward travelers.

The United States Capitol's former columns still stand.

A miniature rainforest is growing inside of a Midtown Manhattan office building.

This Boston medical museum features the skull of the famous medical case of Phineas Gage.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

A walk through the historic city center, under the streets of Seattle.