This medieval church is the only one in the world that features all Marc Chagall stained-glass windows.

In this scale model, our neighboring planets are represented by metal spheres spread across an English village. The nearest stars are represented by spheres in California and Australia.

The Origin of On the Origin of Species.

Behind one of the world's most impenetrable vaults is a massive collection of retail silver.

A labyrinth hides in plain sight at each of the city's 270 Tube stations.

The library houses an incredible collection of some of the world's most impressive books and manuscripts.

A charming 17th-century alley is lined with secondhand bookstores and antiquarian shops.

The Art Deco artwork depicts gilded carriers of deadly illnesses.

The only university zoological museum in London houses extinct animals, bizarre natural history specimens, and a Micrarium of microscopic creatures.

A quiet, semi-secret square with statues of Mahatma Gandhi, Virginia Woolf, and a conscientious objectors stone.

A gruesome and mysterious ancient sculpture of a pagan deity from the Roman occupation of Celtic Britain.

Don't be surprised if you see a long-necked dinosaur peeking out from among the trees in Northgate Park.

An Industrial Revolution-era public work that purified water using nothing but sand.

A cabin completely covered in coffee mugs, where visitors are welcome to leave one of their own—if they can find an empty nail.

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

Controversially claiming the title of world's biggest bass drum, UT's Big Bertha was once made radioactive by the Manhattan Project.

A view-altering observatory at the University of Texas.

Turning night into day in Victorian-era Austin to thwart a serial killer.

DIY collection of eclectic holdings.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

Giant animal sculptures are created with the rice straw leftover from the fall harvest each year.

An exquisite grouping of structures made from 10 tons of invasive saplings.

A former electrical substation is now home to an eccentric junk art masterpiece.

This failed condo development was reborn as a street art hub.