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Places visited in Koloa, Hawaii
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Places visited in Postojna, Slovenia
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Camac Street
Philadelphia, Pennsylvania

Camac Street

The last of Philadelphia's wood-paved streets is now a landmark of terrible engineering.
39.9487, -75.1614
Trakošćan Castle
Trakošćan, Croatia

Trakošćan Castle

This Croatian fairytale castle is slowly falling apart thanks to years of neglect.
46.2577, 15.9451
Pont d'Arc
Vallon-Pont-d'Arc, France

Pont d'Arc

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."
44.3820, 4.4160
336 ancient columns
Istanbul, Turkey

Basilica Cisterns of Istanbul

A marvel of Byzantine engineering under the streets of Istanbul.
41.0084, 28.9779
Serpent column with the Obelisk of Theodosius in the background.
Istanbul, Turkey

Serpent Column

Ancient serpentine sacrifice holder that has stood the test of time.
41.0056, 28.9751
Obelisk of Theodosius
Istanbul, Turkey

Obelisk of Theodosius

This remarkably well-preserved Egyptian plinth is pretty well traveled for a giant piece of stone.
41.0059, 28.9754
Spouting Horn Park
Koloa, Hawaii

Spouting Horn

This Hawaiian blowhole is supposedly caused by a trapped monster.
21.8848, -159.4932
The end of the trail
Koloa, Hawaii

Lithified Sand Dunes

A prehistoric landscape hidden in the cliffs of Kilauea, Hawaii.
21.8925, -159.4108
Captain Cook, Hawaii

Place of Refuge

Ancient holy grounds that granted amnesty to all those who stepped inside.
19.4215, -155.9105
The green sand on Papakōlea.
Naalehu, Hawaii

Papakōlea Beach

Semi-precious green sand on Hawaii's big island.
18.9361, -155.6465
The Canada France Hawaii Telescope.
Hilo, Hawaii

Mauna Kea

Earth's tallest volcano is home to a dozen world-class observatories.
19.8244, -155.4733
Black Sand Beach
Mountain View, Hawaii

Black Sand Beach

This black shoreline is made up of exploded lava particles.
19.1358, -155.5049
Panorama showing the Sphinx Observatory, Top of Europe Restaurant and Rail Station, and the Research Station.
Lauterbrunnen, Switzerland

Sphinx Observatory

Historic observatory precariously perched at the "Top of Europe."
46.5475, 7.9850
Mont Saint-Michel
Mont Saint-Michel, France

Mont Saint-Michel

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.
48.6352, -1.5105
(Flickr/Elizabeth Thomsen)
Alberobello, Italy

Alberobello

Southern Italy's spinning top village.
40.7862, 17.2376
Pythagoras' cave.
Samos Prefecture, Greece

Pythagoras Cave

Cave on extinct volcano, once home to famous mathematician Pythagoras.
37.7260, 26.6006
The ruins of Knossos.
Heraklion, Greece

Knossos

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.
35.2980, 25.1630
Zadar, Croatia

Sea Organ

A musical instrument played by the sea.
44.1173, 15.2202
The concert hall
Postojna, Slovenia

Postojna caves

A miniature train-ride through Slovenia's largest cave system.
45.7823, 14.2045
Ljubljana, Slovenia

Dragon Bridge

A whimsical bridge adorned with decorative dragons.
46.0519, 14.5102
(Flickr/Trent Strohm)
Predjama, Slovenia

Predjama Castle

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.
45.8158, 14.1267
Postojna, Slovenia

Olm

The "dragon babies" of southeastern Europe.
45.7830, 14.2038
Plitvička Jezera, Croatia

Plitvice Lakes

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.
44.8783, 15.6112
Lake Bled. (Wikimedia Commons)
Bled, Slovenia

Bled Island and Castle

This one-time health resort was used by aristocrats around the world.
46.3632, 14.0899