Go inside to really appreciate this 500-year-old technological masterpiece.

A Canadian POW for German soldiers during WWII where prisoners hatched an elaborate escape plan.

It wouldn't be long after purchasing this farm, Brown would lead his siege on Harper's Ferry.

An anonymous art project beneath Longfellow Bridge where hundreds of trophies line the steel support beams.

Bouncing, delightful, mechanical art at the MIT Museum.

The statue of John Harvard isn't actually John Harvard—or even, technically, the founder of the school.

This massive World War II calculator hearkens back to the days when "computer" was a job title.

MIT students continue the legacy of beloved professor "Doc" Edgerton through learning by doing.

A work of art that pays homage to a Victorian timepiece in Providence.

Hidden in Central Park's Ramble is a troublesome cave buried just beneath the surface.

Retirement home for giant obsolete machines.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

This tiny Bulgarian town offers a stunning location in the mountains and a storied history.

These ruins in Volvi were once at the intersection of the Eastern and Western Worlds.

An alien landscape on the banks of the Aegean Sea.

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

Live a night as a Byzantine King, with a minibar and private jacuzzi.

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

Fortified homes of highland warriors that are still in use today.

Despite being tiny and rural this Georgian airport looks like a sci-fi boondoggle.

Small church on top of a huge rock column.

These Stalin-era industrial 'death traps' hang lifeless above the city

Ancient rock-hewn town that witnessed key events of Georgian history.

Unusual building appears to be haphazardly built from randomly piled bricks.