Public opinion is still divided on this enormous sculpture in front of Baltimore's Penn Station.

Inside this library, the history of Los Angeles is retold through a mural.

Harder layers in colorful sandstone weather out as prominent “fins" and even more intricate and bizarre shapes.

Equipment used to mine silver and lead has been preserved in this almost-ghost town in northern Nye County.

Previously a hot spring, this park remains a site of unique history, wildlife, and geology.

On Waikīkī Beach, a monument to four extraordinary individuals of dual male and female spirits who brought the healing arts from Tahiti to Hawai'i.

A version of this picturesque mill has existed since the 1800s.

This elegant monument to those who fought against fascism is inspired by the shape of the poppy flower.

Inside this Krakow church, an explosion of psychedelic color.

High in the Sacramento Mountains, a facility dedicated to studying the sun.

Colorful outcrops and cliffs just north of Reno provide a scenic backdrop for hiking and mountain biking.

One of the deepest springs in Missouri.

The site where the leader of the Kosovo Liberation Army was killed is now a memorial.

The strongest earthquake in Nevada's recorded history left these spectacular breaks along the west front of a range in central Nevada.

Red sandstone structures dominate this landscape, which has been inhabited for some 5,000 years.

The last remaining building in Washington, D.C., built by H.H. Richardson, one of America's most iconic architects.

The largest underground lake in Europe.

This sculpture presents commentary on a life in pursuit of profits.

Watch butterflies take flight before you fly.

An unexpected sinkhole in a desert flat within Gold Butte National Monument.

The unique design of this former quarry provides ideal acoustics for concerts.

Commemorating the 19th-century labor movement in Australia.

A shoreline exhibit describing the disastrous first attempt by the French to colonize North America.

A commemorative plaque hides a door that leads down to the New York Public Library's underground book bunker.