This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

Though the case is scorched and the buttons half-melted, this hardy handheld gaming device can still run a game of Tetris.

A pedestrian island in the middle of world-famous Times Square emits a strange (and purposeful) humming noise.

The 28-foot granite map plots the locations of 40 theaters in New York City.

A mysterious plaque to the even more mysterious "Fr. Pat Noise," killed in "suspicious circumstances."

This neon landmark has been posing this deadpan question to follicly-challenged Dubliners for over 50 years.

A guitar mounted on a wall in Temple Bar honors the Irish musician.

Dublin's most modern, visually spectacular bridge is modeled after Ireland's national emblem.

This gorgeous space is England's largest independent library outside of London.

This building played host to some of the most influential minds of the Industrial Revolution and now serves as a reminder of the influence of Northern coalfields.

This century-old grotesque has a mysterious history and may not actually be a rabbit.

This sculpture commemorates a naturalist and an illustrator whose work was a forerunner to modern field guides.

The remains of a Dominican friary, once one of the largest of its kind in the United Kingdom.

This giant foot is all that remains of a massive concrete play structure that once stood on the outskirts of Edinburgh.

Scotland's oldest purpose-built concert hall houses an incredible collection of ornate, centuries-old keyboards.

In the depths of Glasgow Cathedral's crypt, one pillar stands out from all others.

A palatial former bank building now houses what may be the poshest art venue (and former Tesco) in Belfast.

These storage facilities offer a behind-the-scenes look at some of Edinburgh's biggest museums.

An unusual entertainment complex full of up-cycled musical instruments.

Accessible only at low tide, the deserted island is dotted with World War II ruins.

Originally commissioned as a sculpture to reflect the history of Belfast's red-light district, the final sculpture has been banned from Belfast public land.

This Victorian-era public house has set the standard for pub-style elegance for over a hundred years.

The only monument to name all of the passengers and crew who died on the RMS Titanic.