An abandoned gun-funded 19th century utopia.

This stunning Connecticut mansion is actually just a one-room-deep hoax.

The last holdout of a pre-Civil War rebel who took the matter of slavery into his own hands.

An organ located deep within a cave, whose "pipes" are the geological features of the cave itself.

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

Outsider art meets paleontology at this roadside reptile repository.

Remnants of a storybook amusement park hidden behind a strip mall.

One of the oldest anatomical theaters in the U.S. still in use was once the site of an infamous cadaver riot.

The design of this historic domed church was influenced by Thomas Jefferson and intended as a statement of religious freedom.

The site where Poe "in great distress, and ... in need of immediate assistance" likely died.

It's not hard to see why the historic Peabody Conservatory of Music's library has been described as a "cathedral of books."

Largest Roman Catholic church in North America.

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

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

Art deco landmark on the outskirts of Washington, D.C.

The United States Capitol's former columns still stand.

The mortal remains of a Russian prince, priest and paranormal investigator who came to America in 1792.

Memorializing an American tragedy of massive proportions.

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

Once America's tallest structure, now a Baltimore landmark.

A museum dedicated to exhibiting remarkable outsider art.

The trials and tribulations of marking Poe's grave.

The land is home to swimming ponies and a legendary 18th-century treasure.

Public outcry led to this bridge's unique character which celebrates a giant frog battle and also sewing.