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Istanbul, Turkey

Basilica Cisterns of Istanbul

A marvel of Byzantine engineering under the streets of Istanbul.
41.0084, 28.9779
Berlin, Germany

Pergamon Museum

The most visited, and possibly most controversial museum in Germany.
52.5212, 13.3969
Underground Cathedral (Flickr/magro kr)
Wieliczka, Poland

Wieliczka Salt Mine

An underground city of salt.
49.9830, 20.0557
Wrocław, Poland

Racławice Panorama

19th century panorama lets you relive a Polish uprising via 120 year old Panorama painting.
51.1099, 17.0442
The Flying Dwarf.
Wrocław, Poland

Wroclaw Dwarves

The silly symbol for an underground protest group is now scattered around the city.
51.1075, 17.0325
Shoes on the Danube
Budapest, Hungary

Shoes on the Danube Promenade

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.
47.5040, 19.0448
Komiža, Croatia

Blue Cave of Bisevo

An ethereal glowing blue ocean cave in Croatia.
42.9784, 16.0111
Trakošćan Castle
Trakošćan, Croatia

Trakošćan Castle

This Croatian fairytale castle is slowly falling apart thanks to years of neglect.
46.2577, 15.9451
Zadar, Croatia

Sea Organ

A musical instrument played by the sea.
44.1173, 15.2202
The concert hall
Postojna, Slovenia

Postojna caves

A miniature train-ride through Slovenia's largest cave system.
45.7823, 14.2045
(Flickr/Trent Strohm)
Predjama, Slovenia

Predjama Castle

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.
45.8158, 14.1267
Nine Views
Zagreb, Croatia

Nine Views

This scale model of our solar system hid in plain sight for years before a physics team sought out all the planets.
45.8348, 15.9708
Podoštra, Croatia

Tesla's Birthplace Museum

Humble beginnings for one of the world's most famous scientists.
44.5600, 15.3085
Plitvička Jezera, Croatia

Plitvice Lakes

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.
44.8783, 15.6112