Australia's largest medical museum featuring a 19th-century pharmacy.

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

The largest and best preserved necropolis in the Western Mediterranean.

A controversial art piece that harkens back to local folklore.

Originally slated to become a luxurious resort, this structure is now a graffiti haunt reclaimed by nature.

An out-of-place grove of sequoias thrives in northern Spain.

A beautiful little museum hidden away in the heart of Barcelona holds a treasure trove of Ancient Egyptian artifacts

Mysterious Spanish catacombs of unknown origins.

A Franco-era dam flooded (almost) everyone out of this centuries-old Aragonese town.

This Navarrese cave's history of witchcraft and pagan ritual is not just embraced, but recreated each year.

Wonderland replication in progress by one persistent man.

A museum dedicated to the Spanish occult in a town that was terrorized by the Inquisition.

Abandoned for decades, trains still pass through the now-restored remains of one of Madrid's first metro stations.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

This abandoned island off the Venetian coast has been a radical monastery, a political prison, and a secret Nazi base.

Venice's island of the dead.

Venice's "Island of the Mad."

As can be expected from a centuries old church built in a canal city, the undercroft of this house of worship is beautifully flooded.

An abandoned 17th-century baroque hunting lodge with a wonderfully strange architectural plan.

Roman politician Herodes Atticus built this nymphaeum to honor his wife, whom he may have murdered.

This hill made entirely of ancient Roman jars was simply a garbage dump to the people of the time.

This ancient Roman prison is decorated with an upside-down cross not as blasphemy but as saintly tribute.

One of the most important yet well-hidden museums dedicated to the history of medicine.

Transport yourself to the 1980s era of video games at this themed restaurant and bar.