These 100-year-old tunnels in downtown Provo house artists, restaurants, and a few surprises.

Originally conceived as part of a proposed Arizona State Capitol building in the 1950s, this structure built in 2004 stands as a monument to the architect's legacy.

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

A restaurant and observation deck built in a unique broadcasting antenna.

This lonely gas station has stood at this location since 1917.

The only ski tunnel in North America provides easy access to amazing snow and beautiful views.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."

This church was constructed by a shipbuilder and designed like an upside-down boat.

Built at the turn of the 20th century, using bricks made and fired from clay found on the property.

This set of three large, volcanic hot springs is a favorite haunt for intrepid divers.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

Crafted in 1911, this steam locomotive spent its entire working life in Flagstaff.

The world's only teal arches exist in a city that cares more about its aesthetic than an Instagram influencer.

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

Hundreds of drawings left by the land's previous inhabitants remain mysterious.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

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

An absolutely beautiful 200-foot stained glass installation traces the evolution of knowledge.

This erect, phallic geological spire wasn't always named so domestically.

This simple stone monument honors a 19th-century tragedy.

Eight rare Corvettes are swallowed up by a sinkhole in Kentucky's National Corvette Museum.

The world's longest known cave system.

This replica of the Greek structure is in the heart of Nashville.