The tallest sea cliffs on the Southern Hemisphere are a climber's worst nightmare.

Woven tree art gives this towering Australian woodland a touch of mystical whimsy.

Australian Lake set aglow by Noctiluca Scintillans.

A castle hand-built by a Spanish dreamer in the Australian tropical jungle.

An abandoned railroad tunnel is now filled with bioluminescent bugs.

The United Arab Emirates's biggest and oldest fort pays homage to a lost era.

An imposing Omani fortress surrounded by date palm trees.

Nature's water park in the Wadi Bani Awf valley is full of pools flanked with cliffs and natural water slides.

Traditional architecture and ancient irrigation systems are on display in this gorgeous mountain village.

This beautifully restored fortification kept the city safe for centuries.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

This slumbering beast honors the Bavarian soldiers who died in Greece during a 19th-century typhoid outbreak.

Overlooking the harbor is a beautiful neglected mansion guarded by two Egyptian sphinxes.

This architecturally eclectic early-20th century mosque was built as a place of worship for the Islamic followers of a Jewish messiah.

A small island with shimmering pink sands, home to loggerhead turtles and rare plants.

Ruins of a 13th-century fortress perched above a breathtaking Mediterranean bay.

This abandoned Greek island was the last active leper colony in Europe.

This field of half-buried stone crosses was the burial place of a sect of heretical gnostics.

An ambiguous ambience emanates from this centuries old leprosy quarantine.

Local lore says two enemy dragons live within these breathtaking mountain lakes.

Scars of this building's past life as a violent prison still cover its walls.

The stoutest tree in the world.

The enigmatic and seldom visited ruins of a Mayan city-state.

The only castle in North America to ever house European sovereigns.