This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

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

The world's largest wooden structure.

A 16th-century Andalusian palace.

An eerie collection of the surviving structures from a past celebration of the future.

Bold black and white motifs of life and death add a dramatic flair to this 17th-century crypt.

Three bridges and one giant canyon make up this fantastic Spanish settlement.

Huge otherworldly domed rocks on the shore of a deadly lake.

Burping, gurgling geothermal mud pots by the Salton Sea.

This abandoned Navy base was transformed into an off-grid alternative living community for thousands of people.

A hand-built folk art installation covered with messages of God's love.

Version of the French Riviera destroyed by the sea.

Colorado Boulevard’s historic bookstore, operating since the bustling city of Pasadena was merely some orange groves and a few ostrich farms.

A British pub embodies the spirit of a California legend.

A Masterpiece with a Tragic History.

Sports history, made in the Arroyo Seco.

"The Star Factory" cranked out Hollywood stars like nobody's business.

Shop selling 500 flavors of soda has something for everyone.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

This former stomping grounds of the most eminent astronomers of the early 20th century.

NASA's leading space science lab started by a co-founder with deep ties to the occult.

This giant temperature attraction created some giant electric bills.

This dormant volcanic crater has been converted from a roiling pit of magma to a pleasant hiking spot.

The southernmost point in the United States is a beautiful place to look at but a deadly place to wade in.