A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

The beautiful baroque library of the Hapsburg empire.

Baroque celebration of the end of the Great Plague of Vienna.

Milan's duomo is covered in beautiful carving including a curious "dinosaur-like" beast.

Italian poet Dante Alighieri is entombed in this small mausoleum in Ravenna, and his hometown of Florence has never been too happy about it.

Filled with goldfish swimming in a shallow pool of sea water, this ancient crypt is more wishing well than burial site.

A diverse collection of wax, bone, papier-maché and mummified relics.

In the world's oldest university is a stunning 17th century anatomical theater carved from spruce.

Renaissance hospital featuring a rotating door into which unwanted babies were dropped.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.

This bronze boar's snout has been rubbed to a golden sheen by visitors seeking good fortune.

One of Catholicism's four major basilicas has a series of papal portraits that are said to predict the end of the world.

The yawning maw of this pagan visage is said to bite off the hands of liars.

Two stunning 17th-century libraries and a cabinet of curiosities.

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.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

From Ancient Rome to WWII, Neupfarrplatz has over 2,000 years of history underneath its main square.

Originally envisioned by King Ludwig II to rival Versailles, Herrenchiemsee's "New Palace" remains half-gilded for lack of funds.

The prototype for all Nazi concentration camps.

King Ludwig I's collection of beautiful women.