An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

A floating cat sanctuary on an Amsterdam canal.

A huge enchanting public park just outside the ancient walls of Rome.

Architectural monsters are devouring this palace's every door and window.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

The final resting place of the poets Shelley and Keats.

At the crypt of St. Mary of Eulogies and the Dead you are left alone to ponder mortality among piles of skulls.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

An alchemist's "magic door" stands in the middle of a Roman park.

This hidden Art Nouveau courtyard is an opulent feast for the eyes.

Architectureal fantasy quarter of Rome.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

The legendary cliffside castle of three-time Voivode of Wallachia, Vlad the Impaler.

Iceland's largest lagoon is home to stunning multi-colored icebergs.

On the shores of Lake Garda, the ruins of a Roman villa that allegedly belonged to the poet Catullus.

One of the most well-preserved castles in Italy also contains a rare medieval example of a port fortification.

A climbing route in the mountains of Italy’s Dolomites, built for soldiers during World War I.

According to the local folklore, the myriad colors of this lake are the result of a lovelorn wizard's blunder.

This overgrown mountain village has been abandoned for nearly a century.

In Lago Superiore, the largest expanse of lotus flowers outside of Asia is hard to miss.

A unique form of erosion created an uncanny landscape of boulders perched atop slender columns of clay.

The highest waterfall in Italy is only "turned on" five times a year.