More than 450 years ago, an Italian nun became the first woman to paint the iconic subject.

Secret refuge and museum of the Duke of Florence.

Over 50 exquisite hand-painted Renaissance maps decorate a Medici storage room.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

This iconic L.A. bookshop is housed in an abandoned bank—both symbolic and chic.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

World's largest collection of serial killer artwork and other macabre exhibits.

La Monte Young and Marian Zazeela's "Dream House" will immerse you in an ever changing world of sound and light.

This grisly exhibit houses skeletons and weapons from a devastating 14th-century clash.

The library's graceful rotunda is like a bibliophile's temple.

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

Museum dedicated to the terror regimes of Hungary.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

Started as a kitchen garden, now the second largest botanical garden in the world.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

Perhaps the most spectacular grotto along the Algarve coastline.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

Berlin's old airport.

What started as a tongue-in-cheek shrine is now a full-blown museum celebrating "The Hoff" and his longtime love affair with Berlin.

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

The most visited, and possibly most controversial, museum in Germany.

A slice of central Asia in the middle of Berlin.