The best preserved Paleochristian basilica in Rome hides a number of oddities and secrets.

This delightful little museum is dedicated to only one thing: pasta.

The secret room where early Bolsheviks cranked out propaganda fliers on a smuggled printing press.

A small but hugely whimsical theater where marionettes play out the "The Battle of Stalingrad."

The charmingly disheveled clock tower of Tbilisi's puppet theater.

This French colonial post office is arguably the grandest in all of Southeast Asia.

Twice a day a speeding train passes only inches from the homes of this residential neighborhood.

This roadside attraction looks like a flying saucer parked atop the tundra.

This one-room museum is dedicated to Norwegian history and jokes.

The burning of this 12th-century church kicked off a campaign of Norwegian Black Metal terror.

A railway bridge leading nowhere stands lonely in the middle of a meadow.

An old hill fort covered in over 100,000 crosses is a symbol of Lithuanian nationalism and beliefs.

This TV tower once secretly housed a GDR intelligence team.

One of the world's heaviest musical instruments towers within a popular urban park.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

An eerie, derelict amusement park in Berlin.

Six beautiful wooden giants are hidden around Copenhagen.

Stay overnight in the world's most sleekly designed rabbit hole, free of charge.

Walk 2,300 feet above the ground on the "Troll's Tongue."