No need to strap in for a "ride" on this walkable roller coaster.

Between Neo-Pagans and Neo-Nazis, these strange rock formations have a curious cult following and a very strange history.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

"The most colorful grottoes of the world.

This World War II bunker now survives as a documentation of the Nazi regime and war crimes.

This "floating railway" is one of the world's oldest monorail systems.

A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

The fairy tale castle of the "fairy-tale king."

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

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

These flying foxes dangle from the trees around the library like fuzzy black fruit.

The longest manmade tunnel in Queensland is now a beautiful trail, home to a special colony of bent-wing bats.

Home of the world's largest crocodile.

A series of sculptures beneath the waves promote ocean conservation and support coral reefs.

The Australian lorikeets that like to tie one on in an annual drinking binge.

A granite waterfall cascading down is one of the highest multi-tiered falls in the state.

You'll find the little birds tucked within the rocks of this Australian beach.

WWI hospital ship lost in a cyclone turns up on the coast of Fraser Island, where she remains rusted and forgotten.

Is there such thing as too many fruit bats? Not anymore.

A wonder of natural limestone formations etched by millions of years of natural interaction between rainfall and rock and air.

White cockroaches and other cave species occupy this massive series of lava tubes.

An incredible garden taking over the interior of a massive sinkhole.

Visitors can swim with vicious predators in Crocosaurus Cove's plastic daredevil enclosure.