Adolph Sutro's little-known, geographically inaccurate, deprecated monument.

Dublin's "Dead Zoo" serves as a window to Victorian museum design.

Commonly referred to as the most photographed Victorian home in the United States.

Oldest existing church in New York and the inspiration for Washington Irving's "The Legend of Sleepy Hollow."

Single runway interrupted by a busy road that cuts across its middle.

Art in the form of a winding, man made crack in stone.

Ancient paintings known as the "Sistine Chapel of Cave Art."

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

Oldest building in California still in use.

The remains of a 12th-century chapter house in Golden Gate Park.

Once thought to be the oldest living tree in the world, Methuselah was germinated before the Egyptian pyramids were built.

A masterpiece in Golden Gate Park by virtue of the artist’s debt.

Internationally-recognized arts center housed in a century-old former military barracks.

The prototype for all Nazi concentration camps.

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

The United States Capitol's former columns still stand.

Where a staggering 747 ships were constructed during World War II.

Large collection from the 3rd millennium BCE.

Only hotel where you can legally launder money.

27-room home built with the fortune of a sugar magnate.

The legendary statue-hating superintendent of Golden Gate Park is honored with... a statue.

Once the largest windmill outside of Holland, with enormous 114 foot sails.

The best place in the park to test out your throwing arm.

This turn of the century masterpiece has a mysterious goaty interloper.