The blinking light atop the iconic landmark has been sending secret messages for decades.

An intricate network of underground tombs carved into volcanic rock.

This 12-inch-tall wooden sculpture of a winged Virgin Mary has inspired much devotion and countless replicas.

The gondolas let you glimpse a bird's-eye view of one of the world's highest capital cities.

An elaborate shrine dedicated to the four corners of the world unfortunately misses its mark.

A small metropolis of Pueblo cave dwellings have been carved right into the hillside of this national monument.

The 7,000-year-old calcium carbonate formation creates a magnificent natural bridge.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

What was once a summer home next to a waterfall has now become littered with graffiti and children in swimsuits.

Once the smallest park in the national system.

A peculiar forest that was handcrafted for government experiments.

Is this 47.7-mile stretch of highway the longest straight road in the United States?

Come for the fried chicken, stay for the history at Oklahoma's oldest bar.

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.

A small island with shimmering pink sands, home to loggerhead turtles and rare plants.

This beacon for pre-radar pilots once guided Charles Lindbergh to a safe touchdown in Tulsa.

The largest mural in the world painted by a single artist.

A mysterious and terrifying public art goblin seemingly meant to inspire local legend.

The grandson of a Kiowa chief created what has become the iconic symbol of a city on the Plains.

One of the largest Masonic temples in the world, created at the height of the oil boom in ostentatious style.

This blowhole is supposedly caused by a trapped monster.

This industrial area was the dumping ground for massive amounts of trash, some of which washes up as tiny bits of sea glass.

This unusually circular centenarian barn became a Route 66 icon.

A half-size replica of the World Trade Center towers above Tulsa.