According to a local legend, this bridge was constructed by an astrologer with the help of the devil.

A series of caves, tunnels, and wells filled with fascinating figures and symbols.

Some of the saint's blood and bones are said to reside in Dublin.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Quite simply the largest tree in the world (by volume).

This statue and park honor the Swedish chemist Jacob Berzelius, one of the founders of modern chemistry.

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

There's something in the air as history repeats itself at this museum dedicated to the Swedish pop band.

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

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

An 11th-century runestone decorates the halls of Terminal 2 of this Scandinavian travel hub.

Outside a Viking museum sits a modern-day runestone made by a Swedish runemaster using traditional methods.

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

Stockholm's narrowest alley is barely over two feet wide.

It is said that each of the white stones in the red facade of this medieval house represents the head of a murdered Swedish noble.

An ancient Viking runestone hidden in plain view in Stockholm's old town.

Stockholm's deepest subway station is also a stunning ecological wonder.

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

Stockholm's decidedly unique public transit system has doubled as the world's longest art gallery for decades.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

These banned cigarette vending machines now sell little pieces of pocket-sized art.

A sharp bend in a dramatic river canyon cut through red rocks.

A monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.

Like a kitschy mirage in the Mojave, this eatery serves up classic 50s-style diner meals and a dinosaur sculpture garden.