A drab two-story office space in Delaware is a hidden tax haven for Hillary Clinton, Donald Trump, and over half the Fortune 500 companies.

Yo, Adrian!

A clone-tree in Washington Square Park sprung from seeds that went to the Moon and back.

Dr Barnes' $25 billion private collection of art and arboretum.

The first American department store, and home to the largest operating musical instrument in the world.

This elaborate towering structure was once famed for its revolutionary height.

Vacant Beaux-Arts buildings that serve as reminders of a beach town’s glory days.

A reservoir of vintage pinball machines and arcade games for the nostalgic and thrill seeking.

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

Offering commanding views of the California coastline, this restaurant was a hub for the artists and bohemians of Big Sur.

Life in this isolated, hilltop lighthouse was lonely, but it sure was lovely.

The bluer than blue waters in these natural Israeli caves are reached via the world's steepest cable car.

This subterranean funicular is one of the world's smallest subways.

Neighborhood in Jerusalem is home to the ultra-orthodox haredim.

An ancient quarry rediscovered by a dog and claimed by biblical kings, a German cult, and the Freemasons.

Descend 2,030 years into the past in an ancient tunnel built to support Jerusalem's most famous wall.

The home of the Dead Sea Scrolls is an abstract modernist dream.

The remains of this ancient fortress atop a manmade hill look as though they were built into a volcano.

Five sultans and their families rest in eternal splendor, teeming with overlooked beauty and drama.

A marvel of Byzantine engineering under the streets of Istanbul.

The largest bell in the world has been swinging high above a Cologne cathedral for almost a century.

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

Fortified medieval tower house with lovely roof garden.

In Florence's great Duomo, a 26 foot fresco honors a mercenary famous for attacking Florence.