A wondrous old library overlooking the nation's capital.

A religious-themed park filled with folk art to bring biblical stories to life that fell into disrepair and now being restored.

This beautiful stone arch bridge wasn't even expected to stand for one day, but people have been crossing it for centuries.

The first blast furnace in the United States that used coal and coke fuel instead of charcoal to make pig iron.

Abandoned Italianate architecture on the coast of Maine.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

A well-preserved relic of the industrial age steel and iron works that dotted West Virginia.

A restored Pittsburgh house of God has been converted to a marvelous house of suds.

The NBA player's elaborate former home is now a ghost of its old glory.

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.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

New York's oldest magic store.

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

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

A bizarre house filled with an astounding array of collections.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

The legendary building that needed ghostly approval before being built.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

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