Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

The arch that celebrated the completion of the Lincoln and Victory highways.

Las Vegas's very own 40-foot-tall fire-spewing praying mantis.

Small Nevada town embraced its designation as the "Armpit of America" with an Old Spice-sponsored festival.

The second-largest gold nugget in existence, displayed in a Las Vegas casino conveniently named the Golden Nugget.

A grand Gothic Revival basilica with stained glass depictions of Montreal's religious history has only one soul resting in its crypt.

One of the largest underground systems runs under Canada's largest urban center.

One of the Seven Wonders of the Modern World holds the world's tallest metal staircase.

A 98-room castle in the middle of Toronto that bankrupted a 19th century electricity multimillionaire.

Canada's accused-traitor-turned-folk-hero is buried under a red stone in a ring of his own.

A fitting attraction for the corn capital of the world.

America's largest man-made forest was planted in an effort to bring back the past.

An ornate Art Deco tile mosaic representing Nebraskan life, both modern and prehistoric.

Roaming bison and a spectacular view at the highest point in Nebraska.

This recently restored timepiece has stood all around Kansas City.

The largest wildlife crossing in Utah allows local fauna to safely traverse the six-lane Interstate 80 at Parleys Canyon.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

Once the product of an inexplicable gold strike, this ghost town is now home to one man and his love of classic machines.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

See massive fossils that are over 200 million years old in northeastern Arizona.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."