Where the Great Wall of China meets the sea.

The evocative ruins of a 1,000-year-old hill fort lie within a popular tiger reserve.

The only surviving fragment of the lost Narragansett Pier Casino.

The world's second-largest sundial, made entirely out of stone.

An extraordinarily ornate museum in San Diego holds wondrous anthropological treasures.

The world's largest outdoor organ is played weekly by one of just two civic organists in the U.S.

North America's largest accredited model railroad museum.

One of the largest trees of its kind in California.

An inconspicuous suburban street corner is the site of San Diego's worst air disaster.

The American rainmaker and a burst dam.

The Giant Lemon of Lemon Grove.

Educational foundation that teaches the powers of fourth dimensional physical properties.

A natural dome made of volcanic glass in Inyo National Forest.

History, geography, and shamanism meet in this eye-catching monument to the greatness of three empires.

A nondescript dirt lot hides an intriguing center of shamanic healing.

The graveyard holding the remains of George Washington's slaves was forgotten for nearly 200 years.

Elvis's own personal tropical hideaway.

This Memphis recording studio launched the careers of Jerry Lee Lewis, Johnny Cash, and Elvis Presley.

The hotel where Martin Luther King Jr. was shot is now a museum dedicated to his work.

This replica of the Greek structure is in the heart of Nashville.

At 135 years old and counting, this historic print shop is heaven for poster nerds and music buffs.

This giant temperature attraction created some giant electric bills.

A mocking tribute to the past and modern leadership of Prague.

A huge communist-era propaganda monument and mural that offers stunning views of the Mongolian capital.