This eagle-topped spire remembers the military commander who snatched up California for the United States.

A tree grown from astronaut seeds which were exposed to cosmic rays.

A lighthouse built to save lives that took quite a few with its treacherous location.

This neon lit Georgian cave claims to hold the boulder Prometheus was chained to.

Take respite inside this jaw-dropping church while climbing the volcano where Georgia's Prometheus was once chained.

Small church on top of a huge rock column.

The first skyscraper to include a Ferris wheel built into the facade.

Fortified homes of highland warriors that are still in use today.

Rock-hewn monastery complex with hundreds of cave structures tucked away into the mountainside.

The charmingly disheveled clock tower of Tbilisi's puppet theater.

Underground monastery and fortress.

Goethe's "Faust" was inspired by these rock formations known as the "Devil's Pulpit" and "Witches' Altar."

The powerful party began with a secret meeting in this shikumen in 1921.

A surreal, Gaudi-inspired play space near an Anaheim community center.

Burial grounds for more than 1,000 bodies deep under the modern town of Rabat.

The longest hedge maze in the world.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

Home to the "Circus" trees created by Axel Erlandson.

Nose around a unique collection of more than 300 natural aromas used to craft perfume fragrances.

Each year these high desert hills are absolutely covered with poppy flowers in a surreal show of nature.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

This small New York museum examines Chinese history from its origins right up to its arrival in the city.

The name of this tiny pocket park tucked between two buildings on Manhattan's Upper West Side is Latin for its location: "seventy-one."

The mummified relics of an American missionary.