The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

This forgotten building was one of the few Philadelphia-area breweries to survive Prohibition.

Philadelphia boasts one of the best — and most often overlooked — traditional Japanese gardens in North America.

Huge masonic hall in Philadelphia with lavishly themed rooms.

Developers built a Walmart around one family's plot and constructed a mausoleum in the parking lot.

An underground magnet for ever-changing street art.

Mai Tais and Navy Grog served up in one of the original tiki bars.

The former home of the hard partying literary power couple is now one of the only museums devoted to their story.

Oldest unrestored plantation house in America that is open to the public.

Paths are maintained, but trees have taken over plots.

The record holder for the world’s largest peach.

This scented city oasis was a labor of love.

This former prison is an Art Deco masterpiece with a past full of civil rights flashpoints.

The ruins of a once massive plantation are now a private residence hidden in the Florida wilderness.

The haunting remains of a failed housing development can still be found behind the big box stores that were to anchor them.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Megachurch turned Catholic church comprised of 10,000 glass panes.

Twin Peaks' real life Double R Diner has been restored to its damn fine television look.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

The ghost town that ended up on Ebay.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

Odd outsider art installations surround a Gold Rush-era ghost town.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

The first declared National Monument in the United States.