Once the future of underwater combat, this old sub is now open for visitors to muck around in.

A bit of retro transportation flair preserved in the world's largest department store.

Once the tallest building in the world and the site of "the highest dinner ever held in New York" this building now holds the most expensive penthouse in the city.

The "Seinfeld" diner.

Elevated freight railway turned wildly successful urban park.

A beautiful and abandoned New York subway station from 1904, complete with chandelier.

The first car-centric shopping plaza in the U.S. brought a little bit of Spain to downtown Kansas City.

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

Four, 18-foot-tall badminton shuttlecocks lie scattered about the lawn of a Kansas City museum.

An interesting decoration on this historic site, this weathervane comes with as many legends as it does questions.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

One of the last remaining World War II Victory Gardens in the U.S. is quietly growing across from Fenway Park.

Dim sum, served in a grand old theater.

This upscale streetwear store is hidden behind a fake Snapple machine in the back of a deli.

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

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

27-room home built with the fortune of a sugar magnate.

255 feet of suds, scrubbers, and blow dryers.

The peaceful space is adorned by paintings by the famed abstract artist Mark Rothko.

The key to turning shifting dunes into the green oasis of Golden Gate Park.

This private residence was the template for one of the most beloved television homes of all time.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

Staircase winds down the side of Telegraph Hill through gardens, wild parrots flying overhead.

San Francisco's newly reopened hands-on science museum.