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

Eccentric concrete mansion and museum designed and built by hand from the inside out.

World's first "penitentiary," meant to be humane, drove men insane.

A layered tribute to the work of mosaicist Isaiah Zagar.

Berkeley Hot Springs presents to you "the only outdoor monument to presidential bathing."

America's most famous museum of medical oddities is home to the remains of Albert Einstein's brain.

A super-sized promotional trick that is now a D.C. landmark.

The United States Capitol's former columns still stand.

An astounding collection of medical specimens, including bits of President Lincoln.

A priceless collection of the Nation's cryptologic history.

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

A museum dedicated to exhibiting remarkable outsider art.

Walk through the history of American pop culture.

George Washington's dentures and Queen Victoria's dental instruments are in the nation’s official museum of the dental profession.