The only remaining U-boat that is still floating never actually saw any action in World War II.

This proud Teutonic warrior rises out of a German forest heralding a victory and measuring lightning.

A collection of antique telescopes dot the halls of the university's astrophysics department.

A staggering collection of satellite models and actual flight parts.

The Goose Girl of Göttingen, Germany might well be the most kissed girl in the world.

At this unusual park, domes, ladders, chairs, and more are made from trees.

The original home of the Lego has a huge amusement park dedicated to the iconic plastic toy.

A symbol for the opposition to nuclear power around the world.

This Danish rock field is actually a sprawling ancient cemetery holding the bodies of 700 Vikings.

This unique architectural wonder is home to luxury apartments.

This huge industrial sculpture looks like a UFO and a factory had a baby.

Oberweissbacher Bergbahn - a broad-gauged cable car capable transfering railcars.

A beloved street vendor is memorialized outside a German train station.

Renowned mathematician and physicist Carl Friedrich Gauss once worked at this observatory.

A 1:2 billion-scale solar system leads visitors into this German university town.

These beautiful objects represent beautiful ideas.

An enormous playhouse designed to look like 21 stacked Lego bricks, with another 25 million colorful Legos inside.

A tilted half-timbered house from 1672 is built into a salvaged segment of a medieval wall.

The second-largest Jewish temple in Bulgaria was deserted after World War II, seized by the communist government and then abandoned again.

Said to be the only museum in the world dedicated to the most classic of all blooms, the rose.

A mountain pass in Bulgaria's Balkan Mountains was the site of four historic battles.

The remarkably well-preserved final resting place of a powerful ancient Thracian king.

This tower is all that remains of the mosque that once stood in the center of the city, before it was destroyed by fire in 1941.

A magnificent, glittering building tucked into a tiny Bulgarian mountain town.