Their motto is, "We've been bonkers for hats even longer than you have!"

No two pieces are exactly the same at Portland's hippo-themed hardware store.

On East Burnside, a 24-hour vending machine distributes world-class pastries.

Over 600 vacuum cleaners stack the shelves of what may be the cleanest museum in America.

Private collection of art inspired by cabinets of curiosity.

Once called Winthrop Park in 1889, home to a decidedly sexy tribute to the Monitor vs. Merrimac battle.

A visionary Italian architect created an impressive cluster of concrete structures for a family's private tomb.

As can be expected from a centuries-old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

Go inside to really appreciate this 500-year-old technological masterpiece.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

Two stone columns flank the grand Venice square, but there were supposed to be three.

The pile of books behind the dignified writer gave the statue a most undignified nickname.

A fake medieval village in the middle of Turin.

This building has a giant piercing through one of its corners.

One of the world’s smallest bars, just 13 square feet, is brimming with speakeasy flair.

A brutalist gem towering over the heart of Milan.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

A maritime museum holding the remains of Blackbeard's pirate ship.

An anonymous art project beneath Longfellow Bridge where hundreds of trophies line the steel support beams.

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

A modest reminder of treacherous waters at the Golden Gate.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Ancient ruins hidden underneath a modern luxury hotel.