Where the U.S. government kept its actual treasure, before Fort Knox.

Gigantic private toy museum featuring among finest collections of antique mechanical banks in existence.

North America’s largest collection of horological devices and home to a colossal clock with a dizzying array of features.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

The highest point in New Jersey is marked by a massive, if simply named, obelisk.

A monumental statue of RCA's mascot now sits atop a historical society roof after a life of moving around.

This remarkably simple jail went over a century without an escape.

An artsy hidden staircase leads to breathtaking views of San Francisco.

Abandoned Coast Artillery fort now serves as graffiti canvas and sightseeing vantage point.

This frozen tunnel in central Alaska is both an engineering feat and a valuable climate classroom.

A park with one large cat sculpture and 15 smaller ones, all painted by different Colombian artists.

A 250-year-old timepiece-automaton adorned with golden mechanical birds, which still sing to this day.

'The Letters of Utrecht' lays out a ribbon of poetry one letter at a time, with no final verse in sight.

On rare days, this abandoned castle's gatekeepers open its doors, revealing the eye-popping splendor hidden inside.

Crumbling ruins of the thermal baths that once attracted royals and aristocrats from throughout Europe.

A sulfuric hellscape in southern Italy.

Local lore says two enemy dragons live within these breathtaking mountain lakes.

Croatia's towering concrete blossom grows from the site of a World War II concentration camp.

A small Portuguese cottage formed between boulders in the countryside.

Sitting right on the border between East and West Jerusalem this modern art museum is in itself a symbol of Israel's hoped-for unity.

Get tall with nature's lankiest beasts and their warthog friends at this Kenyan preserve.

Berlin's beloved bear is immortalized at the Museum für Naturkunde.

An amusement park on the grounds of an unused nuclear power plant, with a swing ride inside the cooling tower.

A church filled with the bones of hundreds of virgins martyrs—or so they say.