A two thousand year old brothel uncovered in Northern Greece.

Island wonderland for communist autocrats.

A musical instrument played by the sea.

An ethereal glowing blue ocean cave in Croatia.

A marvel of Byzantine engineering under the streets of Istanbul.

This quirky curiosity shop takes its cues from the world's bazaars.

A spherical "micro-nation" in the heart of Vienna.

The final resting place for the remains of 143 Habsburg royalty.

An old department store turned Nazi prison turned artist commune.

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

Super-heavy Nazi architectural experiment.

A museum of alchemy and a basement laboratory all housed in an ancient building in a Gothic tower.

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

The beautiful baroque library of the Hapsburg empire.

A tropical paradise just a short trip from the opera house is filled with beautiful winged creatures.

Handsomely crafted representations of our round planet.

A small museum filled with over 1,000 clocks, and one particular clock calibrated to run until the year 9999.

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

The former private quarters and office of Dr. Sigmund Freud now hosts a museum housing the works of the founding father of psychoanalysis.