The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

This landmark cemetery in Boston was created more than 300 years ago.

Statue in Salem of the woman who starred as the witch Samantha in the sitcom "Bewitched."

A bit of retro transportation flair preserved in the world's largest department store.

Concrete strongholds stand guard over the Golden Gate.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

Not merely a museum – but a whirring powerhouse that offers a subterranean peek into the heart and soul of cable car operations.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

The final resting place of soldiers' loyal canine companions.

This monument on Breed's Hill proves that one of the most famous battles of the Revolutionary War is misnamed.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

Synagogue built from the stones of Solomon's temple contains the golem of Prague.

This one has sailed five times as far as Sir Francis Drake's famous ship.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

Breathtaking and huge 430 year old maps of Italy.

Gaudí's famously flamboyant architectural style is on full display in this sprawling park and garden.

Eighty million natural history specimens call this gargantuan museum home.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

The most loyal of little dogs, or a Victorian era publicity stunt?

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.