ock masses have fallen upon the side
walls of several of these lesser gorges, converting them into
picturesque winding tunnels and changing deep alcoves into caves which
require candles to see.

It is a region of very unusual interest and charm.

SHOSHONE CAVERN NATIONAL MONUMENT

On the way to the Yellowstone National Park by way of the Wyoming
entrance at Cody, and three miles east of the great Shoshone Dam, a
limestone cave has been set apart under the title of the Shoshone Cavern
National Monument. The way in is rough and precipitous and, after
entering the cave, a descent by rope is necessary to reach the chambers
of unusual beauty. One may then journey for more than a mile through
galleries some of which are heavily incrusted with crystals.

LEWIS AND CLARK CAVERN NATIONAL MONUMENT

Approaching the crest of the Rockies on the Northern Pacific Railroad,
the Lewis and Clark Cavern is passed fifty miles before reaching Butte.
Its entrance is perched thirteen hundred feet above the broad valley of
the Jefferson River, which the celebrated explorers followed on their
westward journey; it overlooks fifty miles of their course.

The cavern, which has the usual characteristics of a limestone cave,
slopes sharply back from its main entrance, following the dip of the
strata. Some of its vaults are decorated in great splendor. The
depredations of vandals were so damaging that in 1916 its entrance was
closed by an iron gate.

This cavern is the only memorial of the Lewis and Clark expedition in
the national parks system; there is no record that the explorers entered
it or knew of its existence.

Two hundred and thirty miles east of the Cavern, Clark inscribed his
name and the date, July 25, 1806, upon the face of a prominent butte
known as Pompey's Pillar. This would have been a far more appropriate
monument to the most important of American explorations than the
limestone cave. In fact, the Department of the Interior once attempted
to have it proclaimed a national monument; the fact that it lay within
an Indian allotment prevented. The entire course of this great
expedition should be marked at significant points by appropriate
national monuments.

WIND CAVE NATIONAL PARK

In the southwestern corner of South Dakota, on the outskirts of the
Black Hills, is one of the most interesting limestone caverns of the
country. It was named Wind Cave because, with the changes of temperature
during the day, strong curre