The headquarters of the Mahanikai school of Buddhism, Thailand's largest monastic order.

This complex of vertically-excavated Buddhist, Jain, and Hindu monolithic temples in India's Maharashtra providence illustrates a spirit of tolerance characteristic of ancient India.

Rock-cut cave complex filled with ancient Buddhist artwork.

15 monolithic temples emulate an eroding sand castle.

A palatial sculpture park was built illegally and in secret by a self-taught artist over 36 years.

The 953 windows undoubtedly make this the world's most beautiful screened porch.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

The largest earthwork effigy in the world.

A modern temple with an ancient philosophy.

A battle between nature and architecture in the Cambodian jungle.

Bizarre Hindu and Buddhist sculpture park.

An ancient jungle temple carved into a rocky overhang of the Dane Soung Plateau.

More than 200 statues filled with cryptic symbols give this park spot an aura of horror vacui fantasy.

Stunning wetlands ablaze with pink lotus flowers.

Enormous lake at the bottom of a unique cave system.

An underwater restaurant, surrounded by a coral reef.

Medicinal spa created with the discharge from a geothermal energy plant.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

A beautiful geyser under environmental threat.

Hollowed out cedar log tubs set in an ancient towering forest.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

The twists and turns of this serpentine maze are over 170 years old.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.

Macabre astrological automaton clock dating to the late 1400s.