This curious fresh and salt water lake holds a secret that draws in deep divers from around the world.

The abandoned medieval theme park was meant to be the "Disneyland of the Philippines."

This wondrous waterfall rushing down a green-covered mountain wasn't discovered until 2010.

Underneath the historic center of Mexico City, the remains of a temple dedicated to the Aztec god of the wind.

This stream-carved gorge has inspired poets, hidden smugglers, and trained soldiers, all without losing its beauty.

The district's only illusionarium supports free writing programs for local students with every purchase.

A diminutive memorial marks the site of a successful assassination by a right-wing death squad in America's capital.

The world's oldest soul food restaurant is also one of its best.

Once a sewer culvert, this road tunnel now offers cyclists and pedestrians a subterranean stroll under the C&O Canal.

A brass plaque dedicated to a convicted cannibal hangs in the National Press Club, and that's not even the craziest part of the story.

A museum cafe showcases Native American dishes and indigenous ingredients from across the Western Hemisphere.

Government testing at the asylum briefly explored using marijuana as a "truth serum" on Nazi prisoners of war.

A cavernous three-story, 43,800-square-foot basement that was forgotten about for 60 years.

This grand gothic brewery has been pumping out suds for over a hundred years.

With over 100 jam-packed rooms to explore plus elaborate tea services and events, the Mansion on O Street is a hidden treasure.

A Civil War fort in the middle of Washington, D.C. has been swallowed by a forest.

An Industrial Revolution-era public work that purified water using nothing but sand.

The sign at the garden gate reads: "These Plants Can Kill."

The railroad tunnel nicknamed the "Bloody Pit" for taking the lives of hundreds during its construction.

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

Behind this beachfront shop lies a spectacular, colorful sea cave with an equally colorful past.

This lovely little burbling creek is actually a deadly waterway that has dragged down everyone who ever set foot in it.

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

Legend says this ancient pagan site can cure all ailments.