Once the longest bridge in Ireland, this rusting span sits abandoned and overrun by nature.

Huge standing stones mark a site of megalithic mystery.

This controversial Irish show cave is home to a massive formation known as the Great Stalactite.

This natural rock formation features seemingly unnatural vertical ridges that have been blamed on elves.

A giant concrete orb in far north Iceland marks the ever-shifting boundary.

A vintage video game wonderland in downtown Reykjavik.

Iceland: home to volcanoes, waterfalls and, apparently, Santa?

Iceland's largest geothermal mud pool is a little bit haunted and a little bit dangerous.

Climbing Iceland's highest peak on the rim of the Oræfajökull volcano.

This scenic Icelandic lava flow is named for a pair of Berserkers who were murdered, according to a famous Saga.

The summer tourists on these cliffs are thousands of seabirds.

These quaint French houses dangle precariously over a precipice.

The fantastic architectural models of a French traveler.

Beautiful carved tunnels.

Hundreds of secret cabinets built into the walls of legendary poisoner's private work room.

Sleep in a climate-controlled plastic bubble for the night.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

Renaissance villa and gardens complete with a tormented colossus.

Architectureal fantasy quarter of Rome.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

The middle finger of modernity.

This community on a small Venetian island has taken to painting their houses in bright neon hues.

Stalactites and stalagmites in a beautifully lit cave.

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