World Trade Center memorial likened to a woman's sexual organ.

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

The origin of this mechanical boy was a mystery until he revealed his maker by writing it in perfect cursive.

Tour the dark and beloved poet's former cobwebbed basement, which may have inspired "The Black Cat."

Yo, Adrian!

Erected in 1697 this Philadelphia bridge is the oldest surviving roadway bridge and perhaps the oldest stone bridge in the United States.

This Transylvania County city is home to a rare white squirrel population that is descended from an escaped carnival animal.

This road in the Great Smoky Mountains was supposed to assuage a displaced community, but ended up a $52 million dead end.

A monument in Washington D.C. marks the spot from which all other roads were supposed to stem.

A sacred site for Native Americans surveyed by George Washington and owned by both King George III and Thomas Jefferson.

Exact replica of the ancient monument, but much, much lighter.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

A monument marks the location of the first successful steamboat demonstration.

Eighteen miniature death-scene dioramas.

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

The United States Capitol's former columns still stand.

This collection of odd proofs of concept is like taking a walk through the imagination of a Victorian engineer.

A pre-Industrial Age iron furnace and the site of a nearly-forgotten piece of Black history.

A priceless collection of the Nation's cryptologic history.

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."

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

The longest escalator in the Western Hemisphere takes over three minutes to ride down.