This remarkably well-preserved mosque stands amid an 11th-century caravansary.

Five ancient libraries, little changed for centuries, preserve a medieval archive of Quranic lore and civic documents

Exploring the wilder, more passionate sibling of Erg Chebbi feels like discovering a secret sun-kissed planet from another galaxy.

This vast masterpiece of Moroccan architecture spreads across 20 acres.

A fortified city, home to a remaining population of five families

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

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

Order a salt beef-loaded beigel at any hour of the day or night at this East End institution.

Hear the quietest sound from across the dome.

Hidden beneath the streets of London is a secret subway that only carried mail.

This former convent has been reimagined as a community center for artists.

Home to the oldest operating roller coaster in the Southern Hemisphere.

Saved by the community from destruction, this sign has become a national treasure.

This abstract sculpture was initially so disliked that it got moved to the outskirts of town a few months after installation.

A museum dedicated to the former country.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

Exquisite wall sculptures carved in secret by an early quarryman in an obscure corner of the Paris Catacombs.

A series of waterfalls so massive they straddle the border of Argentina and Brazil.

Final resting place of Antarctic explorer Ernest Shackleton.

The most southern point you can drive to in the Western Hemisphere.

The southernmost Anglican cathedral in the world has whale bones standing in its yard.

A bright little alley in La Boca is a part of tango history.

The humble tomb of an Argentine general, hand-built by his son using stones brought down from the Andes.

105-foot wide giant metallic flower blooms anew every day in the heart of Buenos Aires.