A sweet symbol marks the place where torturous executions were once carried out.

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

This sculpture commemorates Edinburgh's sister city and their respective celebrity dogs.

The final resting place of soldiers' loyal canine companions.

A six-ton wedding present for the King of the Scots.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.

A quartet of brightly colored mythical beasts stand sentry at this gateway.

This small museum in a 17th-century building honors three iconic Scottish writers.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

More than five miles of underground passageways.

Oldest surviving example of a Dutch saltbox frame house in America.

Two mermen, eternally spitting into each other's mouths.

The first evidence of some of the Earth's earliest life was found in this fossilized undersea grotto.

A beautiful multicolored mound formed by the mineral deposits of the Orenda Spring.

A monument to the military service of America's greatest traitor refuses to even name him.

Bouncing, delightful, mechanical art at the MIT Museum.

This nearly endless university hallway is home to a unique sunset known as "MIThenge."

This bridge was the birthplace of a unit of measurement based on a fraternity joke.

A multi-storied adobe complex has been inhabited for more than a thousand years.

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

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

An essential stop before plundering, BYO Cutlass.

Tiki luxury on Nob Hill.