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

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

This sandstone mansion was the home of two of Oregon's most important pioneers.

Step back in time on this preserved 1800s farm.

Some North Carolina Cherokee have been keeping their history alive for decades with a single play.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

A toxic ghost town sitting atop a massive coal fire.

This curio museum seems like the type of place you might find a mogwai or a monkey's paw.

This railroad and oil tycoon's lavish estate now stands as a time capsule of the Gilded Age.

The walls of America's oldest masonry fort famously "swallowed" cannonballs.

Must form and function forever remain at odds? Not if the Florida Department of Transportation has its way.

For 32 years the famous Ringling Bros circus troupe spent winters in this sunny spot in Florida.

One of the last of the great 1920s movie palaces is a Floridian Greco-Spanish-Persian dreamscape.

These former theme park figures have a new lease on life outside a water plant-turned-restaurant.

One-time winter retreats of prolific inventor Thomas Edison and his friend Henry Ford.

The famous boat that once ferried Bogart and Hepburn still floats in Key Largo after being abandoned for years.

It's a pretty creepy lock-up.

A monument celebrating the idea of reaching inaccessible places.

A tribute to Ponce de Leon's supposed quest for eternal youth.

The former home of the Nobel Prize-winning American writer is now home to dozens of six-toed cats.

Where manatees are the snowbird vacationers in these balmy Florida springs.

These crumbling foundations are all that remain of the once-stately 1840s manor that gave the town of Bradenton its name.

The strip club's VIP lounge is actually a rare repurposed Futuro House.

Step back into the glory days of Florida's nascent tourism industry at this Gilded Age palace.