The largest and best-preserved Roman amphitheater in Africa was designed to seat 35,000 people.

Enormous statue of the Emperor of the Mongols.

The oldest Buddhist monastery in Mongolia has survived centuries of invasions, political shifts, and religious purges.

A huge communist-era propaganda monument and mural that offers stunning views of the Mongolian capital.

A jagged silhouette of shamanistic stone heaps rises from the shore of this dazzling mile-high lake.

An eerie, derelict amusement park in Berlin.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The fairy tale castle of the "fairy-tale king."

This vertical pinnacle in China was the inspiration for the floating mountains in the movie “Avatar.”

A part of the world's largest marsh seems to be growing bright red Martian grass.

A fifth-century temple improbably built into the side of a cliff.

An Australian lake whose pink hue defies scientific explanation.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

A 16th-century horror show built in a lovely Italian garden.

This otherworldly palace-mausoleum complex is the stuff eternal dreams are made of.

A lake with hundreds of ancient skeletons surrounding it. The surprise is what killed them.

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

Centuries-old bridges grown from tangled roots.

More than half of this Indian palace is drowned but it looks all the more spectacular for it.

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.

A mecca for India's Jains.

The remains of what was, not so long ago, the world's largest city.

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

Nailing a coin to this holy stump is just another way to ask the gods for relief from dental pain.