These medieval skyscrapers dominate the skyline of this small Tuscan town.

Five candy-colored villages on the Italian Riviera.

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

Where the alchemists dream of transmuting base metal into gold was actually achieved.

Concrete strongholds stand guard over the Golden Gate.

A second generation sun-powered marvel lights up the night.

Where a staggering 747 ships were constructed during World War II.

An "anarchical" no man's land, complete with garbage sculptures and a hobo-run "Landfillian Library."

Over 315,000 preserved amphibians and reptiles in jars.

Playable, historic pinball machines fill this Alameda museum.

The unbelievably opulent home built for an infamous newspaperman.

Quite simply the largest tree in the world (by volume).

A "gravitational anomaly" located in the redwood forests just outside of Santa Cruz, California.

Statue dedicated to the star of an old television show.

At the largest railway museum in the United States, you can see everything from an early steam engine to a functioning Thomas the Tank Engine.

A tribute to one granddaughter's old apartment which now represents the whims of each visitor.

It was originally part of a "terrible lizards" collection at the 1964 New York World’s Fair.

Once one of the world's great cities, Cahokia was a place of religious worship, trade and mass human sacrifice before being mysteriously abandoned.

The drama of nature in full effect in this Nevada State Park.

A planet-hunting astrograph built in the 1920s to seek out the so-called "Planet X" beyond Uranus.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

Most-visited and most-photographed slot canyon in the American Southwest.

Dramatic river bend surrounds a natural red-rocked pedestal.