Ride the subways of yesteryear.

Legend says the water within these mysterious sacred springs stays cold even when boiled.

A massive Celtic cross secretly growing in an Irish forest.

This ancient Irish tower could easily have stood in for Rapunzel's prison.

An ancient chamber filled with wonderful rock art and a Neolithic carving of a human face.

Wallabies live naturally on this Irish island.

A former fortified tower now houses a collection of classic communications equipment.

The block of aged dairy is probably still edible after 2,300 years in a peat bog.

A spectacular hidden beach in Ireland has the dark, disturbing nickname of "Murder Hole Beach."

A proud bronze billy stands as an eternal symbol of Ireland's oldest festival, where a goat is made king.

This quaint Hungarian railway system is operated exclusively by children between the ages of 10 and 14.

This hidden art nouveau gem was designed by an architect in search of a national style.

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

A Hungarian pharmacy museum with a box full of mummy powder.

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

The abandoned "Red Star Train Graveyard" is the final rusting place for precious artifacts of train history.

Possibly the world's largest hourglass only needs to be reset every New Year's Eve.

A series of caves under Castle Hill that once held the prisoner Vlad Tepes, better known as Count Dracula.

Once the home of a hermetic monk, this cave now houses a small church.

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

This Hungarian castle was built out of cardboard and wood until it proved so popular that it got upgraded to stone.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.