This amazingly preserved Gold Rush town is a historian's dream.

A concrete block embedded with thousands of pulled teeth was created by a local dentist to memorialize his dog.

Fresh wooden posts have been added to ancient holes to recreate a primitive henge clock.

Quirky water tower advertises the long-gone Brooks Tomato Products Co.

This folk art wall claims to be the world's one and only memorial to the bygone age of hippies.

The iconic remains of the original Academic Hall that burned down in 1892.

This majestic tree has survived 400 years of storms, droughts, and floods, and is a beloved natural landmark in Missouri.

This titanic oil company sign is a reminder of the Americana boom of the 1970s and also its commoditization.

University City's quirkiest resident lives in a park named after its first.

This recently restored timepiece has stood all around Kansas City.

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.