The bears may be gone, but their old cages can still be found.

Radical Bookstore and Community Space.

Site of a famous 19th-century transcendentalist utopian community, now abandoned.

One of the now-less-hidden floral gems of the "Emerald Necklace."

The often-overlooked ruins of one of the first buildings designed by famous landscape architect Frederick Olmsted.

Dim sum, served in a grand old theater.

A beautiful Victorian-era cemetery, complete with a miniature village.

An enormous, inside-out glass globe built in 1935.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

The first Russian Orthodox church in the Catholic city of Rome in almost a thousand years.

Roman-era ships unearthed...

This historic recreationist school churns out warriors that may very well have had a fighting chance in Rome's pits of the day.

Vast network of air raid tunnels beneath Lombardy's capital.

An incredible menagerie of more than 3 million taxidermied animals at the oldest science museum in Europe.

This natural gas vent certainly earns its name as the smallest volcano in Italy.

The fairy tale castle of the "fairy-tale king."

These gutted monastery ruins still stand proudly in the middle of the Italian countryside.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

This private skyway is filled with art and was expanded explicitly so that Hitler could appreciate a river.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

An Italian ghost town that fought obscurity, until a mysterious illness brought it to its knees.

A formerly opulent Italian village is now a crumbling ghost town that no one really knows what to do with.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

An ancient artistic garden parlor full of hidden water wonders.