You feel like you're in a forest, but you're actually walking amidst the branches and trunks of a single giant tree.

A Belgian self-built tower inspired by the Bible and ancient civilizations.

A magical and peaceful ruined Cistercian abbey in what is now southern Belgium.

Seaside ruins of a settlement that date back to the first century B.C.

A passage grave used in neolithic rituals.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

Bordered by forest on three sides and the ocean on the other, the Great Dune of Pilat is the highest sand dune in Europe.

This narrow path was cut right into a French mountainside to feed the country's early naval expansion.

Abandoned Nazi train station turned underground astroparticle laboratory.

Natural stone arches form a walkable "cathedral" at low tide, then disappear entirely when the water returns.

Numerous sculptures set along hiking trails symbolize and idealize the relationship between man and nature.

Not one, not two, but three natural bridges remain in this captivating spot post-sinkhole.