A walk through the historic city center, under the streets of Seattle.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

The stickered marker pinpoints where the only maintained road in the United States crosses into the polar region.

Two hundred tons of pioneer artifacts were painstakingly recovered from a shipwreck at the bottom of the Missouri River.

One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.

This unique crypt designed by Frank Lloyd Wright for his longtime friend was not completed in either man's lifetime.

Comprehensive gaming collection of over 30,000 electronic games and consoles.

What remains of the simple red brick chapel where the women's rights movement began.

This New York estate was designed to resemble a medieval Scottish castle.

An antique cemetery in New York, this land is home to any number of famed corpses.

A collection of the best toys ever made inside a museum devoted to play.

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

The home, museum, and death site of Kodak's influential founder.

"Call for the doctor, call for the nurse... Vote!! said the lady with the alligator purse."

A well-worshipped shrine to the Virgin Mary nestled inside the last of Zagreb’s historic gates.

This library and museum is dedicated to the life and literature of the Indianapolis native author.

Two Indiana icons are honored at this tiny museum, which features the world's largest collection of James Dean memorabilia.

A collection of relics from the Spiritualist Camp Chesterfield.

A giant toy jack made of numerous welded-together fire hydrants.

Dispersed across 45-acres, 39 structures house a massive collection celebrating American Folk Art.

The remains of a deserted 1800s farming community can be found in Little River State Park.

A red sandstone freestanding monolith rises out of the sea in northern Scotland.

Looking strangely like Rome's Colosseum, this unfinished tower has dominated the skyline for over 100 years.

A labyrinthine network of chambers with a storied past hides below Edinburgh's South Bridge.