The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

This communist behemoth is the heaviest building in the world and a legacy of a brutal regime.

This remote island village was in danger of depopulating completely until a tunnel was built to connect it to the rest of the world .

A massive sustainable farm designed by the mastermind behind Central Park.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

One of the tallest buildings in Iceland, and perhaps, the most visually impressive.

The prototype for all Nazi concentration camps.

Erotic art covers the walls of the largest ancient pleasure palace.

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

The mummified heart of a saint lives on in this church—after a brief hiatus when it was stolen.

Real bones which are said to have belonged to a Polish dragon.

An underground city of salt.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

Romania's triumphal arch looks out over Bucharest.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

A perfectly circular stronghold constructed in the 10th century is now a nucleus of Viking culture housing a museum, village, and reenactment of an epic Viking battle.