Huge abstract sculptures of the Puerto Rican Flag.

The 606 is a decade in the making.

Africa's Venice on stilts.

This bronze sculpture was inspired by a photograph of Martin Luther King Jr. and his wife embracing after he won the Nobel Peace Prize.

These items are all that remain from the room used by the author during his second tour of the U.S.

This massive tea kettle was once a promotional stunt for the Oriental Teashop.

The Boston square dedicated to the dark poet who was born nearby.

The remnants of a Gilded Age elegance preserved in the middle of a stark modern tower.

This steep slide at a kids’ playground went viral after an police officer tumbled down it.

Ice cream stand, snack bar, and time capsule of milk conveyance.

To find the "unicorns of the deep" you've got to go downstairs.

The house is an iconic pilgrimage site for fans of the Illinois-based emo band.

This gem from the industrial age helps visitors and residents alike traverse hilly Stockholm.

Swing by this brightly painted former cannery on the water for a crash-course in local boating history.

This homeless brass fox tugs at your heartstrings from the foot of a Stockholm bridge.

A golden plaque marks the site of the mysterious unsolved assassination of the former Swedish prime minister.

What looks like a birch tree smushed between two pieces of glass often confounds commuters.

This pair of unsuspecting buildings are in fact the very first modern skyscrapers in Europe.

A miniature model of the iconic Stockholm department store.

A temporary art piece to celebrate LGBTQ Pride is now a permanent part of Stockholm's traffic landscape.

Now a hotel, this former bank was the site of a robbery that spawned a psychological phenomenon.

A concrete mushroom that divided Stockholm residents for nearly a century.

It houses the remains of a 17th-century version of the Titanic.

The Swedish flag over this small naval fort signals that the nation is at peace.