An elderly widow still operates the incredibly detailed model railroad she and her husband built by hand.

Astounding collection of coin-operated games and automata.

Some believe that this ancient mural depicts technology far ahead of its time, but in reality it's nothing quite out of place.

The unfinished final resting place of some of Spain's most prominent politicians.

Where an 11th-century flying monk crash landed after attempting to take to the skies.

This beautiful 16th-century necropolis marks an astonishing feat in heritage conservation.

This alley off Edinburgh's Royal Mile contains remnants of the city's seedier history.

The ruins of a medieval castle that once belonged to one of the most powerful families in the Netherlands.

A popular 19th-century natural landmark is now hidden within a sprawling forest.

Known as the Royal Palace of the Euganean Hills, this often overlooked castle has been home for multiple noble families over the centuries.

The ominously named cave is home to some remarkable ancient art.

This medieval sanctuary's tree-framed door looks like a portal to a mythical realm.

Climb to the top of its spiral spire for spectacular views of Copenhagen.

The remains of an abandoned dinosaur theme park litter the woods just off the highway.

Once the "Eighth Wonder of the World," this iron railroad bridge was decimated by a tornado.

At high tide this strange footbridge appears to have no purpose whatsoever.

An ancient burial ground believed to have been used for ritual sacrifice.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

This amazingly well-preserved villa just outside Pompeii boasts rare examples of ancient Roman paintings.

Cretean quarry suggests real-life site for ancient Greek myth of the man-eating Minotaur in his labyrinth.

The Greek War of Independence was declared at this medieval Byzantine sanctuary.

A rare surviving Victorian greenhouse designed specifically to house giant water lilies.

Enormous sandstone towers loom within a Czech forest.