The century-old bell and clock tower at UC Berkeley is the third-tallest in the world, and has fossils.

An vast warehouse of everyday treasures in Berkeley, CA.

This Arizona observatory is famous for investigations into Martian life, and as the place humans first spotted Pluto.

The site of Billy the Kid’s most famous escape and the end to the Lincoln County War.

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

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

Island where motor vehicles are banned -- home to the only carless highway in the United States.

The fifth-longest suspension bridge the world, connecting one Michigan peninsula to another.

The biggest museum dedicated to insects in North America, one of the largest in the world.

A massive Montreal stadium that has seen nothing but trouble since its inception.

This lovely, if imposing, piece of Canadian gothic is possibly the most photographed hotel in the world.

This steep cable railway has been hoisting passengers in the heart of Québec City for over a century.

The first Russian Orthodox church in North America and an Alaskan landmark.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

Sparkling, calcite-covered skeletons of children who may have been sacrificed to appease an angry god.

The site of the earliest colonial settlement in the Bahamas started as a place of religious refuge.

Lone survivor from Custer's Last Stand forever preserved.

A tiny racehorse graveyard in the middle of a quiet Kansas City suburb.

During the solar phenomenon "Lahaina Noon" this bendy, curvy sculpture forms a perfectly circular shadow on the ground.

The only royal palace on U.S. soil has been a territorial capitol, a military headquarters, and a prison for a queen.

An ode to one of the first concerts broadcast via satellite.

The Denny Substation has been called "the coolest substation in the world" and sits in a densely populated Seattle neighborhood.

The ghostly remains of what was once the world's richest copper mine.