This coastal cavern is associated with the Hawaiian god of creation.

A small collection of iguana-infested ruins hides amid Cancún's bustling hotel zone.

Clap your hands at the base of the pyramid, and the song of a sacred Mayan bird will echo through the air.

Every equinox this Maya pyramid puts on a spooky ancient light show.

The obelisk meant to mark the founding father's grave at Monticello is actually on the University of Missouri campus.

The iconic remains of the original Academic Hall that burned down in 1892.

A striking sculpture built to honor the women of the Lakota and Dakota Nations.

Giant works of art interspersed throughout meadows and woodlands offer a new discovery at every turn.

The eccentric and colorful pavilions of Tower Grove park are a beloved and overlooked symbol. 

The only bridge in the United States where BASE jumping is legal without a permit year-round.

Every president in history is immortalized in bronze in downtown Rapid City.

The first declared National Monument in the United States.

100-year-old shipwreck you can walk up to at low tide.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

This former coal gasification plant found a curious second life as a popular public park.

This gorgeous beach hides behind two headlands in Oregon's Ecola State Park.

Where Nor'easters go to die.

A massive sea stack famous for its appearance in The Goonies.

An institution that preserves the history of institutionalization.

Home of Howard Hughes' Spruce Goose.

This unassuming cheese empire in rural Oregon churns out more than 150,000 pounds of cheese each day.

The wooden airship was the largest flying boat ever built.

A unique set of caves that spits waves back out into the ocean.

A 1940's shrine dedicated to drowned fishermen on the outskirts of Honolulu.