An archway adorned with vulnerable flora and fauna.

Down this Cracovian street resides a plaque with a stark message about the city's air pollution.

Krakow's own version of the Hollywood Walk of Fame.

Real bones which are said to have belonged to a Polish dragon.

This Polish cave has housed a dragon, a brothel, and an enduring legend.

An underground city of salt.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

Switzerland's oldest public observatory is an important part of the Zurich cityscape.

Once an opulent Art Nouveau hotspot, the Constanța Casino is one of Romania's most beautiful abandoned buildings.

Idaho’s largest, deepest limestone cave is known for its quirky rock formations and bat population.

A surviving concrete arrow from an early-20th-century airmail-navigation network overlooks a reservoir.

The house where the famed outlaw was shot by a dirty coward is now a museum to the criminal's legacy.

Nature has shaped this drainage tunnel into the digestive tract of a mighty beast.

The unusual patterns in this rock formation result from two distinct modes of weathering.

A mining camp built around an unexpected occurrence of silver.

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

A sharp bend in a dramatic river canyon cut through red rocks.

This quirky countryside store is known for the goats that hang out and eat the grass on its roof.

The notorious Wild West outlaw was raised in this unassuming abode.

Allegedly haunted by Walt Disney himself, this inconspicuous lamp is always kept lit in his honor.

The lead horse on a Disneyland merry-go-round that is older than the park itself.

The drama of nature in full effect in this Nevada State Park.

Brightly colored 30-foot-tall totems light up the desert sky just outside Las Vegas.