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

Eat the ultimate iteration of Portugal's most beloved pastry.

The world's oldest bookshop still in operation.

The best place in the world to buy tinned fish.

This unique architectural wonder is also tied to one of the 20th-century's most renowned writers.

Sip cherry liqueur at a bar dating back to 1840.

A pair of oily black spiders lurk inside South Korea's largest airport.

A unique structure located on the grounds of one of five grand palaces that were built by the Joseon dynasty.

The supreme shrine of the state.

This pagoda was once the central feature of a Buddhist temple that no longer exists.

A symbol of hope, survival, and national character, especially after it rose phoenix like from the flames.

Taking the subway here means doing so over a bridge located in the middle of an estuary.

Legend says if you stick your thumb in the hole and it gets wet, your wish will be granted.

A marvel of Byzantine engineering under the streets of Istanbul.

While not Turkey's deepest underground city, this subterranean redoubt is the largest.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

The ancient latrines of the Greeks, in all their public glory.

This elevator was built in 1907 to connect two neighborhoods separated by a steep, rocky cliff.

The alleged house of the Virgin Mary is tucked away in a park and nature preserve on Mt. Koressos in Turkey and is holy to both Catholics and Muslims alike.

Carvings in Turkey's Marble Road may have directed ancient Romans to a hidden brothel.

An underground network of massive stone arches and their skylit vaults support ruins of portico structures above.

One of the most dazzling dioramas at the American Museum of Natural History is also one of the oldest.

This strange sculpture of a menacing skull surrounded by sun rays was discovered at the foot of the Pyramid of the Sun.

About as hidden as can be, this specialty coffee shop is wedged between multi-story buildings at the end of a dark, skinny alleyway in Seoul.