Visible below the waves are memorials to the city's Gold Rush dead.

A unique and poignant sidewalk mural commemorates the deaths of two striking workers.

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

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

No one's quite sure where this quirky university tradition originated.

This taxidermic smorgasbord was co-created by an artist poached from the Museum of Natural History.

Equal parts record-breaking temple to consumerism and bizarre fun park, it's more than you think it is...

Discover diverse aquatic life and befriend resident turtles at this private diving grotto in north Florida.

This natural spring is the winter home to the largest gathering of manatees in the world.

This underground oasis is one of North America’s most fascinating prehistoric places—and you can scuba dive in it.

Washington's iconic carousel has a nice piece of Civil Rights history.

A Nessie-like monster supposedly lurks in this lake.

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

You can still ride this 100-year-old work of art in Brooklyn's largest public park.

Largest institutional collection of tomb figures from Western Mexico in the United States.

The “Grand Canyon of Maine” is a three-mile gorge full of striking geological features.

This candy-striped tower is the farthest east you can go in the United States.

This 19th century granite fortification is one of the most well preserved forts in New England.

The world's only international cryptozoology museum is host to an unrivaled collection of mysterious objects.

A bronze sculpture in the heart of Portland represents Maine’s most defining industry.

This nature mural exists to protect the surrounding environment and its own canvas from destruction.

This Art Deco theater is the last remaining opera house in the “little Broadway of the North.”

Five mythical trolls have taken up residence in woods and hidden on paths at the Coastal Maine Botanical Gardens.

This 1,700-pound edible sculpture is way better than your average chocolate mousse.