This sculpture marks the spot where one of the greatest Roman rulers was proclaimed emperor.

At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

A natural swimming hole that was once a ceremonial center for Mayan priests.

Iconic red and white plaques show the creative names invented to navigate the city streets.

Every equinox this Maya pyramid puts on a spooky ancient light show.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Found down a long dirt road, a sacred Mexican cenote and 18th-century hacienda remain hidden.

An island graveyard with spectacular views of the Caribbean.

Underwater art project will double as a massive artificial coral reef to help regenerate the damaged ecosystem.

A small collection of iguana-infested ruins hides amid Cancún's bustling hotel zone.

This spooky statue sits outside a famous Prague theater.

Edinburgh's oldest statue hides within a parking lot behind the city's iconic cathedral.

Wander among the abandoned ruins of this once-powerful medieval town.

The innocent intentions of this monument are somewhat lost in the sculpture's muscled imagery.

An eccentric priest's tribute to George Washington, this chapel tells the story of the American Revolution.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

This museum explores the grim reality of life in the earliest British colonies in America.

Instead of using billboards, some people here relay their messages on the side of a mountain.

A historic, century-old house plopped along the perimeter of Houston's ballpark.

A mysterious shape catches the eye in this 16th-century painting.

This legendary urban waterfall creates a dazzling display of rainbows.

A California city claims to be the home of a fast-food classic.

Reputedly based on the tomb of Jesus Christ, this crypt is the oldest surviving structure of any cathedral in England.

This memorial museum chronicles the apocalyptic destruction of the First World War.