Ecosystems

This fantastic cave remained unexplored until 1948 when three schoolboys discovered a hidden entrance.

An outstanding piece of retro Sci-Fi architecture built into a sacred mountain.

This 15th-century cave complex is one of the very few monasteries to stay open throughout World War II and the Soviet regime.

The petrified remains of 150-million-year-old trees can be seen in and among the houses of the local villagers.

Crooked windswept pines give this old forest an enchanted and magical look.

A comprehensive collection of bonsai set in a beautiful campus.

A spiritual sanctuary in a natural cave.

A historic cave in Scotland once served as a hiding place for a famous Covenanter.

The artwork is tucked within a cave on a tiny Scottish island only accessible at low tide.

The origin of this sinisterly shaped forest is rooted in mystery.

This Roman quarry once held secret masses and smuggler's contraband and is now home to rare species of bats.

There's a labyrinth of manmade tunnels stretching for over an acre beneath Bristol.

The fishing boats that moor in this small lagoon enter and leave through a tunnel to the sea.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

The first recognized Neanderthal remains were found in this now-lost cave in 1856.

More than 700 species live within this murky marvel of a swamp on California's coast.