This Alaskan town appoints the general store's resident feline as honorary mayor.

This whimsical stacked cabin looks like something out of a children's book.

An unassuming secret door once led to a legendary watering hole.

In this small strip mall resides the largest collection of original art from the famed TV artist.

Bits and pieces from the ill-fated Donner Party's winter cabins.

The now-abandoned tunnels were built for the transcontinental railroad on the route where the first wagon train entered California.

The final resting place of the world's first nuclear reactor.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

The hidden offices underneath Memorial Bridge have been locked up since 1976.

A home built with marble tombstones from the graves of 2,200 Union soldiers buried in a Virginia cemetery.

This otherwise innocuous bodega was once the headquarters of the most feared assassin's guild in American history.

This old train trestle and collapsed tunnel once allowed the railroad to negotiate the steep slopes of the Colorado Rockies.

These decaying bridges 1,000 feet high are a reminder of the skill it took to cross the Colorado Rockies by rail.

You can find America's highest suspension footbridge at Grandfather Mountain in North Carolina.

One of the last surviving C-97s sits in a field in front of a Wisconsin inn.

This massive stained-glass masterpiece is thought to be the largest Tiffany dome in existence.

A 200-year-old bar in the historic French Quarter refuses to give up its place in history, nor its role in securing ours.

Over 100 towers were built in Bologna during the Middle Ages, but only 22 survive.

The final resting place of American icon Buffalo Bill, and a museum that aids in telling his tale.

This once-popular otherworldly landscape was formed by one of the largest volcanic eruptions in history.

This remote Colorado canyon is home to the second-largest collection of natural arches in the world.

See 150 million-year-old dinosaur tracks and bones dating back to the Jurassic period.

The bomb-ravaged remains of of a colossal Neptune.

Giant origami sculptures tucked into desert scenery beckon passers-by to explore further.