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

A former waterfront market is now in the center of town due to some interesting Boston engineering.

True to its name, this bouncy walkway may be the world’s smallest suspension bridge.

The oldest cemetery in New Orleans, resting peacefully for over 200 years now.

The final resting place of New Orleans' most famous voodoo priestess.

A small park on Bourbon Street features life-size bronze statues of New Orleans musicians.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

A pixel art killer whale is frozen mid-leap in this Vancouver square.

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

This underground church is topped with a 500-foot cross that is seen by many as a beacon of fascist hubris.

Mary Kelly was last seen here before she was murdered by Jack the Ripper.

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

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

Mounds, rune stones, and a 1,000-year-old church, left behind by Denmark's first two kings.

The first green space constructed on an elevated viaduct.

An extraordinary "City of Caves" carved from solid stone.

A geological mystery on Camelback Mountain.

The rusting remains are visible sticking out of the waters of the Delaware Bay.

This Delaware River bridge is emblazoned with a catty slogan from a more prosperous time.

Beneath Denmark's Højbro bridge, a bronze merman and his seven sons forever mourn for the mother and wife who left them for land.

A collection of noses tucked inside an art museum reveals how times have changed.

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

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

A unique sculpture park that specializes in the huge and bizarre.