An abandoned shopping gallery built during Fascist Italy tucked in the center of Palermo.

This Arabesque Italian castle was built with a primitive, if ingenious, air-conditioning system.

This triumphal 16th-century arched gateway leads to the oldest street in Palermo.

This mysterious but iconic tapered tower appears in many Azeri fairytales and legends.

The building's fluid, wavelike walls are a true feat of architectural ingenuity.

A unique museum dedicated to culture and artistry of carpet weaving.

A program of Communist glamour in post-Stalin Poland is preserved in this colorful museum.

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

Portugal's National Pantheon has a history of curses, collapses and financial problems.

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

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

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

Legacy of the earthquake that nearly wiped Lisbon off the face of the Earth.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

This crucial gathering spot along the "hippie trail" still displays old notes between traveling beatniks and backpackers.