Railways may have forged this quintet of lovely tunnels, but now they are open to hikers.

A botanically themed auditorium blooms within the world’s last operating double-decker theater.

Designed by Buckminster Fuller, this relic of the 67 Expo survived fire and ice.

Sleep snuggled in a sphere suspended atop the forest canopy of Vancouver Island.

One of Canada's most incredible rare book collections holds hundreds of thousands of gorgeous tomes that the general public can touch.

This Elizabethan hedge maze is one of only six in North America.

An old world fairytale-land with over 350 fairy folk figurines hidden amongst 800 year old cedars.

Fascinating town where normal life interfaces with the occult.

A collection of comics, graphic novels, animation and caricatures devoted to exploring this often overlooked art form.

One of the world's largest collections of pathological specimens.

A collection dedicated to the treatment of disease, held in London's oldest hospital.

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

Northern Ireland's Brobdingnagian stepping stones.

An easily overlooked stretch of ornate window fronts and gaslight lamps that could be right from the pages of Dickens.

Banksy gives themself artistic license with this piece of London street art.

After being destroyed by IRA sympathizers, the ruins of this stately Irish manor have sat vacant for decades.

Once the longest bridge in Ireland, this rusting span sits abandoned and overrun by nature.

This singular Irish dolmen is more Frank Lloyd Wright than upright stonehenge.

Obelisks and stone pineapples in the Irish countryside.

Local legend says the remains of Father Christmas lie within the medieval grounds.

An eccentric garden of sculptures crafted in India decorate an Irish green space dedicated to Alan Turing.

This Irish show cave is said to have been the site of a Viking massacre that claimed 1,000 lives.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Under the desolate and windswept northern coast of Barbados stands a small oasis filled with sea anemones.