A trompe-l'oeil statue honoring the first guide dog in North America.

Nassau Hall has served as army barracks, a museum, and played a key role in the American Revolution.

Stunningly detailed mosaics in a New York subway station bring life to the Weimaraners of artist William Wegman's work—and to thousands of commutes.

This curious, round temple is the oldest still-standing marble building in Rome.

Collapsing castle on the Hudson river was once the storage site of military surplus business.

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

A layered tribute to the work of mosaicist Isaiah Zagar.

The world's third-largest crystal sphere has sat in the Penn Museum since 1927 with the exception of one outlandish theft.

Twice a day one of these tragic bronze mariners drowns with the tide to remember all those the sea has taken.

Built hundreds of years ago this downtown iron barrier once protected a much despised king.

A clock set into the concrete outside a Manhattan jeweler has been telling time underfoot for over a century.

This curved Manhattan building was built to house the opulence of John D. Rockefeller's oil empire.

Unrepaired walls from a 1920 anarchist bomb attack.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

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

Great place to have a drink and a bite to eat in an atmosphere laden with New York's Bohemian past.

Become a prohibition rebel.

One of only two commuter aerial tramways in the United States.

Nestled amid the peaks and lochs of the Scottish Highlands, this inn and pub has played host to outlaws and ghosts.

These World War I shooting range tunnels are now haunted halls of underground graffiti accessed through the roots of a tree.

An abandoned dollhouse factory.

A once grand hotel is being retaken by the wilderness it once capitalized on.

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

An eerie diorama that captures the majestic nature of a few prehistoric-looking beasts.