A new sculpture calls attention to climate change in the centuries-old city it threatens.

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

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

Venice's island of the dead.

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

This trio of neolithic stone monuments are fabled to be a king and his knights that were petrified by a witch.

A petite castle folly in the English countryside.

A miniature village mimics the surrounding buildings so well it includes itself.

The ruins of this gorgeous clifftop castle look like something from a fantasy novel.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Macabre astrological automaton clock dating to the late 1400s.

An enormous and lavish Gothic church in Czechia.

A church of bones, decorated with 40,000 human skeletons.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

A spiral staircase twists to the top of this unusual Czech lookout tower.

These 18th century gardens tell a rocky story of the son of Odysseus.

Money made from smuggling sugar helped create this wondrous rock maze in honor of the Prussian Queen Louise.

A tiny basalt mountain with an observation tower overlooking the beautiful Bavarian countryside.

A preserved Nazi labor camp now has a Holocaust museum on site and memorials to the thousands that died while imprisoned at the camp.