Modeled after a famous church in Vienna, Austria—but in Helena, Montana.

A smoke stack so large, the Washington Monument could fit inside!

New fungal and bacterial species call this deadly lake home.

Native Americans built this circle of stones, which was used to predict astronomical events.

An entire town preserved as a historic landmark.

A 6-mile-long lake created by an apocalyptic seismic event and the deadly chain reaction that ensued.

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

A beautiful geyser under environmental threat.

Historic funicular railway, believed to be the shortest railroad in the world.

Native American burial mounds? Giant gopher dens? No one knows what created the Mima Mounds.

This famous bridge twisted itself into oblivion, but not for the reason you might think.

The longest continuous lava tube in the continental U.S. offers 2.5 miles of dark explorations for the adventurous.

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

Cave carved out of a huge snow drift collapsed killing one and injuring five in July 2015.

A huge musical sculpture and other art installations on the National Oceanic and Atmospheric Administration grounds.

Old submarine parts have been converted into faux whale fins.

A 50-year old dive bar that has its own yacht club.

Allowing humans and fish alike to migrate from freshwater to saltwater and back again.

An eclectic restaurant serving from and to the nearby Chittenden Locks.

Continuing a tradition of movie magic on the site of America’s oldest continually operating movie theatre.

A commemorative mural in this tiny Ballard park honors the neighborhood's rich Scandinavian ties, particularly with Seattle's Norwegian sister city Bergen.

Always a new use for this old building.

A 1,000 pound brass bell commemorates a time when this small maritime neighborhood was actually its own separate city.

Granting the right of way to ships over surface traffic since 1917.