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

This single room has survived the centuries with almost no deterioration.

Rome’s legendary peephole vista is also a former Crusader stronghold.

Tour the oldest unrestored plantation house in America that is open to the public.

One of the oldest living oak trees in the Southeast.

A recreated sign from the movie Jumanji has become a makeshift tribute to the film's late star.

Legends surround this jagged rock formation in the New Mexico desert.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

A historic fort commemorating the United States' naval history.

There are lots of hands and feet stamped in the cement in front of Grauman’s Chinese Theater, but Mel left behind something extra.

Wild West history in Hollywood style.

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

A Looff creation in Santa Monica best described as “a California-Byzantine-Moorish-style fantasy.”

After starting as a whimsical tourist attraction that eventually found its way to ruin, these renovated canals offer a lush and exotic locale on the Pacific Coast.

Resting place of Hollywood's immortals is also site of summer film screenings.

Shop selling 500 flavors of soda has something for everyone.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

This float factory takes the mask off of Mardi Gras and lets visitors see where the magic happens.

The greatest collection of New Orleans masking and processional traditions covering everything from Baby Dolls to Skull and Bone gangs.

Elvis's own personal tropical hideaway.

The ghostly remains of an accidental sea.