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Crypt of the Three Skeletons.
Rome, Italy

Santa Maria della Concezione Crypts

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."
41.9047, 12.4882
The entire ceiling
Rome, Italy

The Dome Illusion

A master of trompe-l'oeil creates a stunning tourist-fooling dome out of a flat ceiling.
41.8990, 12.4798
Tempietto at San Pietro in Montorio
Rome, Italy

Tempietto at San Pietro in Montorio

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.
41.8886, 12.4665
Cats lounging on ancient architecture
Rome, Italy

Torre Argentina (Roman Cat Sanctuary)

Hundreds of lucky felines haunt the ruins where Caesar was murdered.
41.8959, 12.4765
Rome, Italy

Basilica di San Clemente

A Nesting Doll of Churches.
41.8899, 12.4974
The Aventine Keyhole
Rome, Italy

The Aventine Keyhole

Rome's semi-secret peephole vista is also a once and future Crusader stronghold.
41.8830, 12.4786
The Santuario Facade on Monte Pellegrino. (Creative Commons)
Palermo, Italy

Santuario di Santa Rosalia

Cave shrine on Monte Pellegrino.
38.1601, 13.3536
Palermo, Italy

Capuchin Monastery Catacombs

Catacombs with thousands of well-dressed mummies.
38.1119, 13.3392
The apse with the Christ Pantocrator.
Palermo, Italy

Cappella Palatina

Every inch of this chapel is covered in craftsmanship from across the world.
38.1106, 13.3535
Bagheria, Italy

Villa Palagonia

A collection of grotesques lines the walls of this Italian villa.
38.0790, 13.5122
Syracuse, Italy

Ear of Dionysius

Italian cave with exceptional acoustics and an unsavory history.
37.0762, 15.2763
Washington, D.C.

minibar by Jose Andres

Truly adventurous food from one of America's most innovative chefs.
38.8964, -77.0236
Wall detail
Kutna Hora, Czechia

Sedlec Ossuary "Bone Church"

A church of bones, decorated with 40,000 human skeletons.
49.9482, 15.2676
A microscope focused on the leg of a mosquito - marching across it is a near invisible menagerie of colorful animals, from cheetahs to giraffes to elephants.
Prague, Czechia

Museum of Miniatures

Microscopic scenes; some call it novelty, some call it art.
50.0873, 14.3893
The huge Philosophical Hall
Prague, Czechia

Strahov Monastery

Two stunning 17th-century libraries and a cabinet of curiosities.
50.0861, 14.3893
Prague, Czechia

Prague Astronomical Clock

Macabre astrological automaton clock dating to the late 1400s.
50.0870, 14.4208
Zizkov Tower. (freefoto/Flickr)
Prague, Czechia

Žižkov Tower

Looming communist pillar with a Czech twist.
50.0810, 14.4511
Juliet's balcony
Verona, Italy

Juliet's Balcony

Pilgrimage site for star-crossed lovers.
45.4418, 10.9984
336 ancient columns
Istanbul, Turkey

Basilica Cisterns of Istanbul

A marvel of Byzantine engineering under the streets of Istanbul.
41.0084, 28.9779
Denizli, Turkey

Pamukkale Water Terraces

Roman ruins top white travertine terraces formed by ancient hot springs.
37.7735, 29.0865