Northern Ireland's Brobdingnagian stepping stones.

360° views of the city plus five floors of optical illusions and hands-on science.

One part local history, 99 parts gruesome haunted house.

One of the oldest scientific gardens in Britain, containing more than 13,302 plant species in its core collection.

A 1,215-foot tunnel transports pedestrians beneath the River Thames.

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

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

Amidst the bustling streets of Dublin, there is a hushed garden that is dedicated to "All those who gave their lives in the cause of Irish Freedom."

Traditional 11th-century outdoor tannery.

The other side is actually green.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

One of the most spectacular canyons in the world.

Ozymandias’ time-keeping temple.

The somber sculptures commemorating Irish Famine on the river Liffey in Dublin.

A bronze kitty adorns the grave of the polar explorer who brought the original feline to the Antarctic.

Leave a trinket at this artistic collection of mailboxes.

An awe-inspiring mosque in Morocco with one of the tallest minarets in the world.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

Deliberately hidden for centuries, the magnificent Saadian Tombs were eventually uncovered in 1917.

The largest madrasa in Morocco once housed more than 900 students within its exquisite walls.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

The final resting place of the great navigator, or maybe his brother.