Sited in an Inner Mongolian desert are the remnants of an important trade stop along the Silk Road.

A Japanese-era military tunnel is now a psychedelic art exhibit.

The easternmost town in Alaska can only be accessed from Canada.

Hauntingly beautiful totem poles left by the Haida.

A detailed pachyderm supports Rome's smallest Egyptian obelisk.

This is the oldest Roman-made bridge in the city still existing in its original state.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

A forgotten "city of water" underneath the famous Trevi district.

Hundreds of lucky felines haunt the ruins where Caesar was murdered.

A small museum in a ward on the east side of Tokyo showcases the works of one of Japan's greatest ukiyo-e artists.

This lesser-visited gallery in a corner of the Tokyo National Museum complex is an architectural beauty dedicated to the ancient treasures of Hōryū-ji.

An enormous pair of straw sandals woven in the traditional way—to keep demons at bay.

An unexpected curiosity cabinet hidden within a department store in the Japan Post tower.

This isolated Japanese mountain village untouched by time showcases unique and stunning traditional architecture.

Its collection distills more than 60 years of pop culture in Japan, from Godzilla to Hulk Hogan.

Hot springs monkey spa in the middle of Hell's Valley.

A unique work of automotive art calls this shopping center home.

A hidden church in a hidden courtyard tells the story of the Miracle of Amsterdam.

A rare tour of an aristocrat's private home reveals valuable 17th-century paintings from artists like Rembrandt.

Amsterdam's former hotspot for public executions and dissections.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

The attic of a four-century-old canal house hides a clandestine church.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

Partially collapsed lava tube and cave system complete with concert hall, underground pond, and unique albino crabs.