The site of the first couple's first kiss is commemorated by the most adorable presidential monument ever.

This unauthorized stone mermaid was secretly carved out of public stone before being permanently preserved.

Four glass boxes hover over 1,000 feet in the air to give visitors an unparalleled view of Chicago.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

No one is sure if the world's fourth-largest diamond had been found in a rubbish heap or was pawned by Napoleon's mom.

Step back in time and witness the fall of Constantinople.

This hunter-gatherer architecture is believed to be the oldest religious complex known.

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

Housed in an old British jail, this spot serves up Georgian, Russian, and Ukrainian specialities with a side of Turkish history.

A section of the long chain that blocked enemy ships from entering Constantinople.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

A sixth-century Byzantine cistern hidden below a modern carpet store.

Legend says if you stick your thumb in the hole and it gets wet your wish will be granted.

The most metal church of all time was built in record time because of an international, pious pissing contest.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

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

A marvel of Byzantine engineering under the streets of Istanbul.

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

Ecuador’s historic seat of government has been quietly looted in recent decades, and no one knows how or by whom.

The world's tallest aluminum statue is also the world's tallest image of a winged Virgin Mary.

A short volcanic hill in Quito doubles as a stellar observation point of an iconic statue.

One of the most historic cemeteries in Quito is an eclectic mix of architectural styles and famous tombs.

This beautiful fountain was sculpted by a female artist who was ahead of her time.

Xul Solar was an artist of alternate worlds, inventor of languages, and dreamer of utopias.