California's own majestic geyser is powered by a subterranean volcano.

Largest collection of mounted dinosaur specimens in the world.

Come for the speed, leave in love with the desert.

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

A rather vulgar example of the transition from Latin to the Italian vernacular.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

Brass cobblestones mark the places where individual Holocaust victims were taken from their homes.

The spot where the fascist dictator made some of his most famous speeches including declaring war on Britain and France.

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

A Nesting Doll of Churches.

San Francisco's oldest surviving monument and meeting place for 1906 survivors.

The largest island on the great salt lake is home to curious creatures and strange stories.

A 90-foot-tall psychedelic "tree" on the side of the highway has baffled passersby for decades.

An ancient and majestic fortress that played an integral role in Portugal's road to independence.

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

Grandpa Rainbow felt the neighborhood needed some color, so he picked up a paintbrush and went to work.

Largest man-made excavation on earth!

Visitors to this library are in for a real-world education in modernist architecture.

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

This geothermal hot spring hides beneath a slowly growing mineral dome.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

This unreal Portuguese palace looks as though it's made from a pile of different castles.