This only museum in the world dedicated solely to mushrooms.

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.

A monument dedicated to a lone, brave invader.

A history of heat is on display at this unique Austrian museum.

The housing complex served as an anti-fascist fortress during the Austrian Civil War.

A patriotic medieval knight in driven-nail armor raised money for widows and orphans of WWI.

This series of Baroque passageways in Vienna's cultural center mix old architecture with modern art.

A neo-Gothic mansion now houses a wunderkammer of analog tech that hits on all the senses.

Giant WWII fortresses that fired 8,000 rounds a minute, now home to thousands of pigeons.

The townhouse where the "Blood Countess" Elizabeth Báthory started her murderous career.

This museum promotes informed contraception by documenting its often secret past.

Legends surround an ancient tree trunk riddled with nails for good luck.

A silly medieval mural preserved on the side of a Viennese house.

Beautiful Austrian natural history museum with carved ceilings and row after row of ancient taxidermy.

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

Legend holds that this knife serves as a chilling reminder of the deadly rivalry between two local builder brothers.

This museum houses and extensive collection of technology contributed by the Polish people.

According to local folklore, this Roman sepulcher was once a throne for the Devil.

A Victorian Gothic masterpiece housing a world-class collection of rare books and manuscripts.

The ornate structure is part of a building boasting more marble than the Vatican.

One of the city's oldest pubs displays a skull said to belong to the country's last witch burned at the stake.

The elaborate clockwork contraptions in this Scottish gallery create small worlds of whimsy and horror.

A series of three shiny letters mark the boundary of an old refuge for those being pursued by debt collectors.

Ornamented with "Bristol Diamonds," this exotic shell grotto is considered to be the finest surviving example from the eighteenth century.