Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

Statue of Lenin, from Cold War era Czechoslovakia, now in a neighborhood of Seattle.

This popular bar has been blurring the line between normal and edgy for more than 75 years.

Granting the right of way to ships over surface traffic since 1917.

Continuing a tradition of movie magic on the site of America’s oldest continually operating movie theatre.

Seasonal, Pacific Northwest cuisine served in a 101 year old firehouse.

From overly ambitious (and eventually abandoned) atomic dream to bustling office park.

Native American burial mounds? Giant gopher dens? No one knows what created the Mima Mounds.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

The remnants of two World's Fairs are here, complete with a 12-story globe, a mini-Manhattan, and a UFO-shaped pavilion.

Visit the monolithic tomb of America's most famous general.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

The most confusing clock in New York.

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

A semi-scholarly approach to sex.

Elevated freight railway turned wildly successful urban park.

An artist's cute bronze subway sculptures belie his violent artistic past.

Named the fifth most beautiful building in America in 1885, this former courthouse boasts the best view in the Village.

A strangely angled West Village home is the only monument to an explosion that took the lives of three American revolutionaries.

Ride the subways of yesteryear.

The site of the deadly Triangle Shirtwaist Factory Fire.

Try not to get slimed in Tribeca.

This sculpture by artist Fritz Keonig survived the 9/11 attacks and now stands as a monument to the victims.

A beach made of semi-precious green sand on the Big Island of Hawai'i.