An Australian lake whose pink hue defies scientific explanation.

World War II ended before these tunnels built to protect vital oil from Japanese bombs were ever used.

One of the few places in the world home to living stromatolites.

A microcosm of the whaling industry in a small Australian town.

The world's first cageless zoo is working to save endangered Tasmanian devils.

The world's "leaniest" tower encourages you to test the gravity of its situation.

The world's first indigenous rooftop farm boasts 2,000 plants from more than 35 different native Australian species.

Peanut butter trees and miracle berries are just the beginning.

A massive concentration of algae is responsible for this lake's pink hue.

6000-year-old coal fire moves one meter per year.

The red crab exhibits one of the most spectacular migrations on earth, despite manmade obstacles.

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

An unphotographable nightly march of tens of thousands of "fairy penguins" from sea to shore.

The only place in America where anyone who wants can shovel coal aboard an antique train.

Home to Hollywood history and a very special salt crystal.

Natural rock water slides hidden in the remote forests of northern Idaho.

These black pillars of volcanic basalt seem to call mountain climbers with an unbreakable siren song.

Home to the deepest rift anywhere on Earth.

Jail from the 19th century that was built by inmates.

The world's first nuclear power plant is open to visitors looking to role-play a meltdown.

It was once used as a classroom to teach mining skills to local high school students.

Three generations of intrepid collectors display their curious artifacts in a homemade museum right next to the caves they discovered.

Site of the creepy house used in Lucio Fulci's "The House by the Cemetery."

Located in a beautifully restored ice house, this museum is the result of decades of hard work and devotion to the craft of plumbing.