The lavish temple of the Cao Dai religion that includes Buddha, Mohammed, Joan of Arc, and Victor Hugo.

A Surreal flight of architectural fancy in Vietnam's Central Highlands.

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

A former French military respite turned jungle tourism hotspot.

A battle between nature and architecture in the Cambodian jungle.

Khmer Rouge's high security prison.

Built by King Norodom to honor his late father.

Numerical symbolism abound at East Asia's oldest observatory.

Ancient temple is home to centuries of art and spiritual artifacts.

Curious crustaceans support an obelisk from ancient Egypt that now stands in modern-day Central Park.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Four cars from the old system were once on display, but were removed in 2014.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

A semi-scholarly approach to sex.

An artist's cute bronze subway sculptures belie his violent artistic past.

Elevated freight railway turned wildly successful urban park.

The most confusing clock in New York.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

A terrific purveyor of natural history objects and curios.

Blighted Irish field and the ruins of a 19th-century cottage on the edge of urban Manhattan.