The remnants of a wooden-hulled fleet built and abandoned in WWI, now home to a thriving ecosystem.

A winding district gerrymandered into the shape of a mantis.

The world-record holder for the longest bridge stretching continuously over water.

Home with Gothic windows featured in a famous painting.

For just a few bucks, this Iowa funicular will let you feel like an 1800s fat cat.

This long unused shot tower on the Mississippi remains a point of pride for a small city in Iowa.

Air Force Academy Chapel made of 100 identical tetrahedrons works to inspire those of all religions.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

This charming colonial alleyway is one of the oldest continuously used residential streets in the U.S.

Quite simply the largest tree in the world (by volume).

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.

These elusive, isolated rodents evolved into a distinct, locally iconic subspecies.

A geological mystery on Camelback Mountain.

The unusual burial monument of Arizona's first governor.

Once a year, at exactly 11:11 a.m., this monument comes to life.

Come for the pizza, stay for a performance on the world's largest theater pipe organ.

An homage to everyone's favorite prehistoric cartoon family.

The world's largest military aircraft cemetery.

These free-roaming horses were once destined to disappear from the land.

This isn't your average roadway—it's actually a National Park and a transportation pioneer.

These unusual rooms on wheels are holdovers from the 1960s.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

The controversial urban planner who designed Washington, D.C., was buried in Maryland, and can presently be found in Virginia.