Central America's deepest lake is actually a volcanic caldera, surrounded by three volcanoes.

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

Get tall with nature's lankiest beasts and their warthog friends at this Kenyan preserve.

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

Gilded heaven for philatelists and architecture freaks, still in full working order despite sitting atop tremulous ground.

A Lovecraftian altar of nightmarish bronze chairs sits ominously on a boardwalk in Puerto Vallarta.

An Aztec temple, the largest man-made pyramid in the world, sits buried in earth with a Spanish church set on top.

No telescopes, no power, no gift shop: The Observatory of Chichen Itza, one of the world's oldest observatories, takes astronomy back to basics.

The largest known Ancient Egyptian obelisk.

Ozymandias’ time-keeping temple.

Sofia's legislative center is continuously reinventing itself.

A striking symbol of the Bulgarian capital.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

The world's largest reflecting pool is just two centimeters deep.

The encased skull that is widely believed to belong to St. John the Baptist.

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

This ancient Greek place of assembly and marketplace is being revealed layer by layer below the modern Athens cityscape.

One of the largest Buddhist stupas in the world keeps an eye out in every direction.

This statue was given to France by the United States to commemorate the centennial of the French Revolution.