This watchtower once presided over the Berlin Wall.

A fascinating insight into daily life in the Eastern Bloc.

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

This historical Netherlands fortress still bears the marks of its single siege.

Incredible labyrinth of man made caves.

A luxury hotel housed in a former 15th century Gothic church.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

In Costa Rica's cloud forest, the roots of a woody ficus create a botanical bridge.

Balanced rock sculptures pay tribute to a murdered conservationist and his pioneer wife.

This abandoned hospital is one of the most haunted places in Costa Rica.

One Costa Rican island is so beset by illegal shark poachers that the local rangers have built an entire bridge with their confiscated gear .

Costa Rican accommodation resembles a crash site, but with a nice balcony.

Once the foundation for a mansion, these ruins now offer amazing panoramic coastal views.

This neon blue river gets its color from a unique mix of bacteria and volcano minerals.

Sloth rehabilitation center in the jungle of Costa Rica.

The cathedral of a controversial, conservative, schismatic sect that declared the Catholic Church heretical and founded its own succession of popes.

An otherworldly art experience.

There was a top secret plan during World War II to seal a group of soldiers inside the rock.

The only Edo-period ferry that is still in operation in Tokyo today.

A road runs through the middle of this small Austrian chapel.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

A fascist-era rural village abandoned since the early 1980s.

For the holidays, the tallest broadcasting tower in the Netherlands turns into one of the world's tallest Christmas trees.

A 16th-century Andalusian palace.