This museum in the famously blue neighborhood of Sidi Bou Saïd showcases a traditional Tunisian lifestyle.

Though it's not the largest, this one-kilometer outdoor market is reportedly the longest in Europe.

The bridge is a secret gallery of discarded gum that has been transformed into miniature masterpieces.

A discarded movie prop that was the original monolith for "2001: A Space Odyssey."

This secret garden has bloomed into London's most unique hub of urban creativity.

This mysterious pyramid is said to be part of a complex web of occult and Freemason symbols.

This lush area was the site of extensive enemy bombing during WWII.

A museum that chronicles the interesting and often dark history of the London docklands, once one of the major trading ports of the world.

A grueling 699-step stairway to a heavenly view of the island of Saint Helena.

These 19th-century gas tanks were remade into an apartment complex.

This 1920s Dutch barge is now a floating bookstore.

The arching stretch of London's longest street holds many reminders of the area's maritime past.

The London pub overlooks where the Mayflower was moored before setting sail for the New World.

The first tunnel to be dug beneath a river, repurposed as an art and museum space.

Ancient barriers wrap around what was once an important stop along the Silk Road.

Light still pours into the ruins of this ancient Islamic observatory.

Controversially restored in the 1970s, this giant 15th-century mosque is shrouded in legend.

The Avenue of Mausolea is a series of grand palatial tombs.

This "tower of death" has acted as an observatory, a religious hub, and an executioner's lair.

A whimsical bridge adorned with decorative dragons.

Despite a fraught and controversial history this African island holds a powerful monument to the tragedy of the slave trade.

This tiny, tranquil Senegalese island serves as a powerful symbol of the Atlantic slave trade.

Built by Portuguese colonizers, the palace is now the seat of power for the independent nation.

An island made out of shells, including a cemetery.