A sudden, striking cluster of hills south of Padua has been attracting visitors for centuries.

Mozart's skull may be held in this collection, but definitive proof continues to elude scientists.

Terrifically morbid cemetary and site of famous Paracelsus' grave.

The amazing wonder cabinets of a very rich Austrian archbishop.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

This military mausoleum captures the solemn grandeur that most memorials only aspire to.

This small Bavarian graveyard is filled with empty graves for German soldiers lost during the World Wars.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

Where Venice's gondolas go for a tune-up.

The only museum with its curator—and her pets—buried inside.

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.

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

Venice's "Island of the Mad."

The oldest of Venice's plague quarantine stations, designed to keep the medieval city safe from disease.

Venice's island of the dead.

The plague quarantine island home to the alleged "Vampire of Venice."

This community on a small Venetian island has taken to painting their houses in bright neon hues.

The small peaceful island off the Venice tourist circuit is where the city began more than 1,500 years ago.

The world's oldest known salt mine.

The remains of the last Bosnian fortress to fall to the Ottomans are still standing.

"Medieval" castle built in the mid-20th century by one family.