Just like in Hollywood, Madrid has also a forgotten walk of fame.

King Carlos IV laid the first stone during construction of this chapel.

These distorting, funhouse mirrors achieved fame in a renowned piece of Spanish theater.

A window into a long-lost world, these colorful tiles advertise a long-defunct range of purgative teas, harmless smokables, and diarrhea cures.

Not far from Madrid, a set of perfectly preserved trenches date back to the Spanish Civil War.

A stone slab in Madrid marks the point from which the distances of Spain's national roads are measured.

Madrid's last horchata kiosk is a blue-and-white beacon of refreshment.

The remaining relics of the patroness of Paris lie in a chapel under a striking double spiral staircase.

A 400-year-old church covered floor to ceiling in ex-voto offerings from the faithful.

This bridge was constructed from the rubble of the infamous Bastille.

The former home of France's controversial pop maestro is almost completely covered in ever-changing tributes and graffiti.

Natural history museum celebrating biodiversity with a parade of taxidermy animals.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

A meow-velous tribute to a beloved street cat, made famous on the internet.

Quite possibly the oldest love poem known to humankind.

This column celebrates Rome's victory over the Goths, and may be the oldest Roman monument in Istanbul.

A small etching on the white marble parapet was written in runic script by a Viking mercenary.

A marvel of Byzantine engineering under the streets of Istanbul.

A mysterious ancient cemetery with Roman sarcophagi and Lycian inscriptions.

Touching displays of wishes for peace from the Cold War era.

The heartbeat of modern Uzbekistan’s thriving market culture.

Beautiful palace stands tall over the Fergana Valley.

The ruins of an ancient Zoroastrian Tower of Silence believed to be the earliest example of the traditional funerary practice.

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