A forgotten "city of water" underneath the famous Trevi district.

The middle finger of modernity.

Legend says this mysterious stone head belongs to a woman who was petrified by an alchemist.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

The oldest operating pharmacy in the world features 800-year-old recipes.

The internal railway of one of the biggest steel plants in America has been transformed into a linear park with unique industrial views.

A bar, burger joint, and arcade housed in a late 19th-century church building.

Mural made of 100,000 pieces of hand blown glass, and until recently, the largest glass mural in the US.

This 15-story mural celebrates the 50th anniversary of the musician's iconic "At Folsom Prison" album.

Two groundbreaking brothers from Pasadena.

The southernmost outpost of the Russian Empire in colonial America.

Art in the form of a winding, man made crack in stone.

A New England-style lighthouse along California's beautiful Highway 1 gets a re-do.

'Cause the fence start shaking, the earth was quaking.

A stellar example of Art & Crafts architecture, and a movie set to boot.

A classically inspired temple in Redwood City.

Honoring the famed folktale author, this California museum looks like it belongs in the Black Forest.

Once close to extinction, there is no shortage of elephant seals on the beaches of Año Nuevo State Park.

Berthed at the Charlestown Navy Yard in Boston, "Old Ironsides" is the oldest commissioned warship still afloat.

Macabre headstones carved with winged skulls, dancing skeletons, and pithy reminders of impending death.

The house where Rudyard Kipling wrote the Jungle Book is also the location of the first tennis court in Vermont.

Two mermen, eternally spitting into each other's mouths.

The gravestone of the suffragist leader attracted extra visitors during the 2016 election.

Visible below the waves are memorials to the city's Gold Rush dead.