One of Ireland's most infamous prisons for rebels including men, women and children.

A marvel of technology a century ago, this disused power station now offers a lovely glimpse into the industrial design of the past.

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

Electrical curiosity museum housed in an old transformer station.

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

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

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

Museum dedicated to the terror regimes of Hungary.

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

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

A traditional American farmhouse plopped in the middle of a Piccadilly courtyard.

An ornate and disused early 20th-century building has been given new life as a fully operational structure, complete with offices, oyster bar, and a furniture retailer.

The beloved beast's taxidermy remains sit in the Natural History Museum's cafe.

The final resting place of a German diplomat's beloved companion.

A mysterious carving from 17th-century London seemingly depicts a young boy sitting on a bread basket.

This Underground station has been a popular filming location for decades, even before it closed.

A sculpture of a famous ape who was once a beloved household name in London.

A network of bells in the pubs and restaurants around Westminster alerts politicians when it's time to cast their votes.

The pockmarks across the building's facade are remnants of the Blitz.

These wire animal sculptures commemorate the exotic inhabitants that once called the Tower of London home.

This may be the last of London's wooden pavements, which were once a common sight in the city.

This ancient oak plays host to carvings of magical elves, gnomes, witches, and other creatures prominent in local folklore.

On a wall in linear London, a plaque hangs at the high water mark of one of the worst floods in fictional Kcymaerxthaereal times.

A faded reminder of what was once a common sight in London during the Blitz.