Numberless clock creates a meal of time for the dreaded, insectile Chronophage.

The Cambridge pub where Francis Crick announced that he and James Watson had discovered the DNA double-helix.

A treasure trove of astronomical, mathematical, and scientific instruments at Cambridge University.

A hidden three-foot-wide house separates these two regal churches.

This irregularly shaped sea fortress has defended not one but three different sovereign states.

Monumental sculptures guard many of the graves, transforming this necropolis into an open-air fine art museum.

The bust of Romania’s most notorious ruler, Vlad Dracula aka "Vlad the Impaler," keeps watch over the ruins of his medieval court.

One of the most controversial statues in Romania is an emperor with no clothes.

The preserved arm of a third-century sorcerer is believed to have the power to lift curses and spells.

Romania's triumphal arch looks out over Bucharest.

This elaborately decorated, fairytale-like Romanian royal palace is one of the most striking castles in Europe.

The possible imprisonment of Vlad the Impaler here earned the medieval castle its nickname, "Dracula's Castle."

This snug medieval lane is one of the narrowest streets in the world.

The European towns of Brașov and Râșnov each have proud signs reminiscent of the Hollywood sign.

A fire once nearly devoured this gorgeous 14th-century Gothic cathedral.

Belfast's namesake river still winds below the city center, hidden from sight.

At this rare mosque in Tbilisi, Sunni and Shia Muslims pray side by side.

The Tudor-style cottage in the middle of the square is not quite what it seems.

A stone marker and sculpture in the city of Riga stake a claim for the very first community Christmas tree.

Flamboyant architecture from the turn of 20th century.

While the U.S. and Soviet Union were engaged in a space race, Poland built a UFO on the ground.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

The oldest housing complex in Riga is a mini timeline of architectural trends.

Six ravens are kept captive (but well-fed) at the Tower of London to prevent the fall of the Crown.