A neo-Gothic church built to thank God for saving the Emperor of Austria from an assassination.

Aged nearly 1,700 years, the world's oldest bottle of wine is probably still drinkable.

The most impressive of Basel's three remaining city gates.

The smallest museum in Basel, Switzerland, is a two-foot-by-two-foot window in the door of a 600-year-old house.

This ferry carries passengers across the Rhine propelled by no engine or paddles but by the river's current.

Museum on French naval history, with magnificent figureheads, a historic diving suit, and a boat used by Napoleon.

The world's largest wooden structure.

This former charity hospital for elderly clergy houses some of Seville’s most treasured paintings.

Its appearance in "Game of Thrones" may spur on the long-awaited restoration of this medieval shipyard.

The final resting place of the great navigator, or maybe his brother.

There was a top secret plan during World War II to seal a group of soldiers inside the rock.

Red, white, and blue painted steps along with a Union Jack celebrate the outcome of Gibraltar's 1967 referendum.

Where members of the Crossbow Corps of San Marino demonstrate their skills.

High in the clouds of San Marino sits an ancient tower with some curious prisoner graffiti.

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

Albert Einstein's head sticks out of a snail shell stacked on a rocket in this truly bizarre monument to the scientist.

This hidden 13th-century tavern room has a few Shakespearean connections.

A beer pipeline runs beneath Bruges.

You can spot this teeny tiny stained-glass window from the Bonifacius bridge.

This former Masonic lodge has been transformed into part museum, part bar, all awesome.

Christ's blood preserved in a Belgian town.

Potato-peeling mannequins, Inca art, and a dangling tuber mobile help trace the history of fries at this Belgian museum.

Explore 400,000 years of humans' "battle against darkness" in this offbeat but thorough lamp museum.

During the holidays, a vintage subway train whisks New Yorkers back in time.