Overlooked amid the tourist bustle of Florence, this museum is dedicated to the craft of stone inlay.

The doodles of a genius line the walls of a secret room under the Medici Chapel, where they were hidden for nearly 500 years.

This strange bovine gargoyle is said to have been put in as a passive aggressive form of revenge.

The famous sculptor left his mark on this Italian wall in an internationally protected example of street art.

Medieval torture techniques with a modern conscience.

The history of German architecture is explored across this fairy-scale mini-city.

This collection of over 50 classic pinball machines awaits visitors to downtown Roanoke.

An overgrown collection of miniature buildings still stand as evidence of one couple's obsession with The King.

Take an otherworldly journey in a school dedicated to out-of-body experiences.

A railroad tunnel that, upon its completion, was considered one of the engineering marvels of the modern world.

The ruins of this Thomas-Jefferson-designed mansion have been left to crumble since the Christmas Day they burnt down.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

The deepest underground city in Turkey was designed to protect 20,000 people behind massive stone doors.

This ancient subterranean megalopolis is known for the hot oil traps that were installed above each of its entrances.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

A giant bronze coil of feces is both a tribute to doggie defecation and a reminder to pick it up.

A Manhattan courthouse hides a small but scathing memorial to Holocaust injustice.

Nonprofit art center that promotes outsider, intuitive, and self-taught art.

A Museum of Holography frozen in 1974.

Where the lovelorn find a home for their sentimental keepsakes.