Maastricht, Netherlands
St. Pietersberg Caves
Incredible labyrinth of man made caves.
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Places on this traveler's wishlist.
Maastricht, Netherlands
Incredible labyrinth of man made caves.
Valkenburg, Netherlands
The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.
Leiden, Netherlands
A market built atop boats is one of the few floating holiday markets in Europe.
Utrecht, Netherlands
This Netherlands museum holds a gloriously mechanical collection of ornate musical automata.
Bourtange, Netherlands
This beautifully designed star-shaped fort was the premier defense system of the late 1500s.
Maastricht, Netherlands
This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.
Amsterdam, Netherlands
A unique collection of gilded age mechanical pianos.
Amsterdam, Netherlands
This subterranean studio is filled with fascinating kinetic art.
Amsterdam, Netherlands
This museum inside Amsterdam's largest cemetery explores how people deal with death.
Amsterdam, Netherlands
This impressive collection of rare books on ancient mysticism inspired author Dan Brown.
Amsterdam, Netherlands
This gorgeous reading room houses the oldest and largest art history library in the Netherlands.
Amsterdam, Netherlands
A curious collection dedicated to human and animal anatomy and pathology.
Pernik, Bulgaria
Founded in the 4th-century, the town of Pernik plays host to the Surva Carnival—a magnificent display of masked Kukeri dancers.
Asparuhovo, Bulgaria
These natural cliffs look like they are a part of an old castle complex.
Kaspichan, Bulgaria
Rock carving created 1,300 years ago 75 feet off the ground.
Perushtitza, Bulgaria
Ruins of an early Roman Christian church dating back to the 4th to 5th centuries.
Samovodene, Bulgaria
Outstanding, eerie frescoes and decorations fill this 19th-century monastery.
Balgarevo, Bulgaria
The site of many battles and tragedies, including the 40 maidens who leapt into the sea.
Gorna krepost, Bulgaria
An ancient Thracian city where fire rituals were practiced on the largest cult altar in Southeast Europe.
Rilski manastir, Bulgaria
This historic black and white monastery is one of Bulgaria's architectural jewels.
Belogradchik, Bulgaria
Bizarrely shaped rock formations in northwest Bulgaria come with equally bizarre legends.
Penrhyndeudraeth, Wales
Neolithic burial chambers hidden beside a village school.
Kilmartin, Scotland
This Neolithic-era complex boasts standing stones, a cairn, and the only henge in Western Scotland.
Kilmartin, Scotland
This collection of Neolithic monuments make up one of The U.K.'s richest archeological landscapes.