A island reachable by a causeway at low tide is possibly one of the earliest Western European locations to be identified in text.

Arthur, Merlin, and Guinevere are among the largest and oldest satellite dishes on the planet.

The largest greenhouse in the world is home to over one million types of plants.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Baroque celebration of the end of the Great Plague of Vienna.

Uh, pardon me, ma'am, but I couldn't help noticing that there's a Columbo statue in the middle of Budapest.

Electrical curiosity museum housed in an old transformer station.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

The world's tallest bridge is also possibly the most elegant.

Two stone columns flank the grand Venice square, but there were supposed to be three.

According to tradition this is the oldest church in Venice, but its actual age is a mystery.

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

The pile of books behind the dignified writer gave the statue a most undignified nickname.

One of the largest squares in Europe contains an entire artificial island.

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

This is the oldest Roman-made bridge in the city still existing in its original state.

This small church was constructed over the ruins of three temples dating to the Roman Republic.

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

In the early Roman Empire, people deemed traitors and criminals were tossed to their deaths from this rock.

Believed to be the remains of the lost Temple of Minerva, this nymphaeum has been known by its misnomer to this day.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

The engineering wonder and pleasure dome of a much-maligned emperor still holds undiscovered secrets.

This subterranean shrine beneath a bike rental store celebrates the iconic Italian scooter.