A massive ancient Chinese city with stone walls and evidence of human sacrifices.

Deep in the countryside lie the remains of one of the grandest Roman dwellings in Britain.

Buried next to Pompeii, this lesser-known Roman villa was the opulent vacation home of Emperor Nero's wife.

A Roman temple perched over an Italian town, forgotten several times over.

This stretch of the ancient Roman road is preserved in a valley that witnessed many battles and legendary highwaymen.

The remains of this medieval Roman road and lookout towers dot the rugged coastline of southern Lazio.

The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

Head past the aisles of tropical fruit and imported candy at this bodega to discover a hidden, weekends-only taco stand.

Nondescript elevator doors open to reveal a stunning, surreal world.

Where the four original members of the Ramones hung out and revolutionized punk rock.

Serving Central Asian breads that range from cracker-crisp to warm and fluffy, this bakery brings Bukhara to Queens.

This nearly abandoned "company town" is a ghost of Puerto Rico's once-lucrative sugar industry.

The ruins of a medieval village that was abandoned after a 19th-century inferno.

A never-inhabited village that was built as part of Mussolini's agricultural reforms.

Half a century after it was abandoned, this ghost town is coming back to life.

Eerie ruins of an abandoned medieval fishing village crumble atop an unforgiving stretch of earth.

This tree was grafted from the actual tree that led Isaac Newton to ponder the theory of gravity.

A mythical garden that once grew the golden apples of wisdom is said to have existed in this ancient Moroccan city.

For centuries this cliffside aqueduct was believed to be of Roman origin, but it actually dates to the medieval era.

Walk along the medieval fortifications that have been protecting Tallinn since the 14th century.

Inside this metro station is a section of the city's former medieval fortification.

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

A surreal museum of extraordinary industrial objects.

Over a millennium ago, this site on the shores of Lake Titicaca was home to a city of more than 10,000 people.