This erect, phallic geological spire wasn't always named so domestically.

This mining town boomed in the Atomic Age when uranium was gold, only to be abandoned when the industry collapsed.

An unusual geological feature towers over the remains of a dark episode in United States history.

The only natural lake in the world that drains into both the Atlantic and Pacific Oceans.

This Yellowstone geyser may not shoot as high as the nearby Old Faithful, but it erupts for considerably longer.

An architect's childhood fantasy treehouse made real.

Native Americans built this circle of stones, which was used to predict astronomical events.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

One of Frank Lloyd Wright's greatest—and favorite—architectural masterpieces was almost lost.

The maze-like transportation hub contains abandoned areas, derelict stores, and a resident bat colony.

An iconic view point of the Sea of Galilee offers a look into Israel's past.

A sprawling ancient Jewish cemetery with over 30 rock-hewn burial caves.

A magical oasis in the middle of the Negev Desert.

Squeezing inside this deep, narrow canyon reveals a festival of desert colors.

A "miracle" that seems to produce more holy fistfights than holy revelations.

This amazing ancient cave was kept secret for seven years to protect it from the public.

A serene desert oasis speckled with ancient artifacts.

Descend 2,030 years into the past in an ancient tunnel built to support Jerusalem's most famous wall.

This daunting 1st century fortress was purportedly the site of one of the most dramatic revolts of the Jewish-Roman wars.

These numerous Israeli caves were dug out over hundreds years for reasons ranging from hideouts to burial sites.

The bluer than blue waters in these natural Israeli caves are reached via the world's steepest cable car.

You can row a boat through this ancient underground reservoir.

This abandoned train tunnel has been the subject of countless ghost stories for years.

Two insane asylum bodies embalmed by an amateur.