A gothic church spire sits atop this skyscraper, the tallest church in the world.

The site of Paul Revere's historic two lantern warning.

One of the indelible moments of the American Revolution took place at this location.

Located in Faneuil Hall, the headquarters of the Ancient and Honorable Artillery Company of Massachusetts has stood the test of time.

A former waterfront market is now in the center of town due to some interesting Boston engineering.

The American Revolution was galvanized into serious action due to the tragic clash with British soldiers that occurred at this location.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

Futuristic apartment blocks are the backdrop for Montreal surfers hangin' ten on the Habitat '67 standing wave.

The world's second largest single-dish radio telescope, once used to contact E.T.

The first declared National Monument in the United States.

An architect's childhood fantasy treehouse made real.

One of nature's most well-scheduled phenomenons resides in Wyoming's Yellowstone National Park.

A beautiful geyser under environmental threat.

Come for the speed, leave in love with the desert.

This freshwater spring fills with 10,000 gallons of water per minute.

As its grandiose name implies, this wooden dome is unsurpassed in size.

Almost half-way between the Equator and North Pole.

Launchpad for the US military’s dead mouse operation to battle millions of snakes.

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.

Strange physical sensations and optical contradictions keep visitors coming back for more.

A monument to the center of the North American continent may be off by a few miles.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.