I Street Bridge is the heaviest swinging center bridge in the United States.

Art Deco stylings conceal the true nature of this bridge.

Shoot for par over the bodies of the dead on this cemetery-cum-golf course.

San Francisco's first World's Fair, dedicated to the wonders of California.

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

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

A garden oasis filled with flowers mentioned in the works of William Shakespeare.

A man-made island in scenic San Francisco Bay.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

A winding path built in secret on the edge of the continent.

This Copper beech tree nestled on a nature reserve is host to a bevy of autographs from Irish literary icons.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.

Graffiti from the 16th and 17th centuries cover the walls of this part of the Tower of London.

Richard III supposedly disposed of his nephews' bodies here in an effort to seal his claim to the throne.

A mysterious shape catches the eye in this 16th-century painting.

This once-controversial and slightly confusing statue of Achilles was built out of captured cannons.

This cemetery overlooking the Benbulben rock formation is the final resting place of one of Ireland's most beloved poets.

These murals stand as reminders to the troubled history of this Northern Ireland city.

A museum dedicated to the tragedy of Bloody Sunday.

Originally built to monitor fishing, this Victorian tower now educates visitors about the local salmon industry.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.