Nineteen ancient rock-cut Buddhist caves can be found on the outskirts of Mumbai.

Constructed in 1923, this is one of several heritage drinking fountains across Mumbai.

The world's largest Tibetan refugee settlement.

At Monet's beloved home you can still see the Japanese bridge, waterlilies, and weeping willows that were the subjects of some of his most iconic paintings.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

The spiral staircase hidden inside this giant Parisian column was likely built for Catherine de Medici's astrologer.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

The site where two doves fell in love.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

This demon atop the Notre-Dame de Paris looks utterly bored.

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

For decades, Puerta del Sol has been illuminated by a giant, guitar-wielding bottle of sherry.

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

A lush indoor jungle fills this bustling Madrid transportation hub.

A pair of gigantic baby heads greet passengers at Atocha Station.

The unfinished final resting place of some of Spain's most prominent politicians.

This macabre masterpiece of a mural is one of Francisco Goya's "Black Paintings."

The world's largest wooden structure.

Touching this little fossil embedded in the wall of a grand mosque-cathedral may make your wishes come true.

Spain's unique Mosque-Cathedral has been a place of worship for both Muslims and Christians throughout its history.

The other side is actually green.

Mosaics, storks, and brothels—this ancient city has it all.

Founded as a refugee camp, now a popular tourist spot.

Commonly acknowledged as the only public monument to the Devil himself.