Ancient rock-hewn town that witnessed key events of Georgian history.

A miniature train-ride through Slovenia's largest cave system.

This one-time health resort was used by aristocrats around the world.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

The golden Buddha statue at the Wat Muang Monastery is the tallest in Thailand, and the ninth-tallest in the world.

This massive complex is made up of hundreds of smaller temples that date back to the ninth century.

Hundreds of Buddhas in a re-discovered Indonesian temple.

These naturally balancing rocks were pictured on every Zimbabwean banknote, up to the 100 trillion-dollar note.

Based on a real event, the statue is dedicated to those who fought and died for Zambia's independence.

Hoodoos, naturally eroded land formations, stand 20 feet tall in the Canadian badlands.

Mysterious rocks that ring musically when struck.

Whisper secrets in a busy station only to be heard on the other side of this acoustic arch.

Europe's largest community of crocodiles and alligators.

The remains of this castle, known as the Witch’s Eye, watch over the Thur Valley.

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

A swath of France so devastated by war it is still forbidden to go there.

An isolated 17th-century chapel on a remarkable site once dedicated to Celtic sun worship.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

Historic medieval fortified city in southwest France.

This salt marsh in Southern France is as pink as the flamingos that inhabit it.