This alley in downtown Chicago held the bodies of over 600 people after the fateful Iroquois Theatre fire.

A bike train runs along a disused railway line through the tranquil French countryside.

A clone of a cloned tree that was so important it allegedly had its own guards.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

A little marble compass above George Washington's (empty) tomb in the Capitol marks where D.C.'s four quadrants intersect.

The Virginia farm where John Wilkes Booth met his grisly end is now largely forgotten.

These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

This North Carolina store preserves a historic moment in America's movement for racial equality.

The antique hotel still has a jail in the basement, though the cockfighting ring is long gone.

The oddly shaped, steam-spewing building is now an art studio and gallery.

This charming railway is one of the oldest and steepest funiculars in England.

The Virginia home of one of the signers of the Declaration of Independence is being preserved with a unique glass facade.

A giant concrete orb in far north Iceland marks the ever-shifting boundary.

An 80-year-old plane tree is devouring an iron bench at Ireland's oldest law school.

A home built with marble tombstones from the graves of 2,200 Union soldiers buried in a Virginia cemetery.

A 200-year-old bar with a cheeky name claims to have served Edgar Allan Poe his final drink.

A metal ring in the middle of the road marks the exact spot where the Soviet satellite crash-landed in 1962.

The early data processor factory founded in Washington for the 1890 U.S. Census went on to become IBM.

An elderly widow still operates the incredibly detailed model railroad she and her husband built by hand.

This doorless 20th-century elevator doesn't stop or slow down.

This unacceptably tall building was the real reason for Washington, D.C.'s skyscraper ban.

A stone marker memorializes the spot where the King broke up a street fight with a classic karate stance.

The towering figures were created from the cemetery's fallen old-growth trees.

This Manchester laundromat is hiding something.