This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

San Francisco Bay's ghost town.

This hidden pre-Columbian rock art depicts a whale hunt.

A charmingly unusual prefabricated metal church designed by Alexandre Gustave Eiffel.

This abandoned nitrate town was repurposed as a dictator's prison.

A 300-foot-long Cold War submarine floats in a Chilean River as a maritime museum.

Spanish religion mixed with local architecture has yielded a network of churches unlike any other.

Locals visit this abandoned train tunnel where a man took his own life to ask favors of his spirit.

This observatory high on a hilltop in the center of Santiago got its start in 1852.

The rusty hull of this 1899 ship serves as a tribute to explorers of the bottom of the world.

In the most arid desert on the planet, the world's leading telescope allows astronomers to see more than has ever been seen before.

Mother Nature outdoes herself with this stunningly beautiful set of caves carved into marble.

This was once the center of the Birdman cult, and is now a World Heritage Site.

This museum covers 10,000 years of Pre-Columbian Latin American history.

How a lunch counter in Chile became a shrine to the 42nd president of the United States

World-famous, Pink's still manages to keep its prized cult fetish status.

A hidden garden of stones engraved with scriptures, a Joseph Smith Sphinx, all carved by one man.

This small memorial is almost as well concealed as Smalls himself was on the night he sailed to freedom.

South Carolina's last remaining slavery auction house is now a museum devoted to its own tragic history.

One man's homage to the sun continues to grow like a glass fractal.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

During prohibition, corrupt city officials ran drinking dens under the streets of Downtown Los Angeles.

The world's only three-story rotary jail is now a museum to a bizarre trend in prison design.

Seattle's own bad art museum located inside Cafe Racer.