A monument celebrating the idea of reaching inaccessible places.

This historic address is home to the beloved ball and is an almost totally empty building among the most expensive real estate in the world.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

Commemorating the spot where the famous scientist fed his pigeons.

The New York hotel where tragic visionary Nikola Tesla spent his final hours, destitute and alone but for the pigeons.

The trials and tribulations of marking Poe's grave.

The twin towers in this Chicago fountain use 50 foot tall video screens to spit on people.

Scattered throughout London are ancient remnants of the city's former bounding wall.

A small but immensely extravagant palace built by the "Night King."

The fairy tale castle of the "fairy-tale king."

A harem-inspired Moorish fantasy design in a Victorian-era Welsh castle.

Recently restored menagerie of Victorian-era beasts.

The world's longest known cave system.

The birthplace of American international flight service has been turned into a celebrity's microbrewery.

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

A medical facility that has been kept frozen in time.

This replica small town lets visitors take a stroll through the story of progress in the U.S. via thousands of Americana artifacts.

Hear the quietest sound from across the dome.

A 125-meter long "tribute to the Brazilian people."

Ruined pieces of stone and a swimming pool are all that remain of an amusement park swept away by a flood.

Where the embers of the Big Bang were first detected.

This modern castle sat empty for decades before a fire inspired its builders to complete its luxury halls.

The largest cemetery in Louisville is the final resting place of Col. Sanders and Muhammad Ali.

The grave of the iconic Kentucky Fried Chicken mascot features a bust of the man behind the goatee.