For a scenic browse, and an answer-page for Guess The World...
....As indomitably as though they had but a few miles to go, the two Futuremen started forward along the white highway in a swinging trot.
The endurance of Grag was practically limitless. And that of Otho's artificial body was almost as great. These two could stand indefinite exertion that would kill an ordinary man. For hour after hour, they followed the highway north through the jungle.
They met no one on that road. Hours passed, as they trotted grimly northward. It was hard to measure time... Oog whimpered with hunger. Eek cowered in fright on Grag's mighty shoulder, as flame-winged birds or flying reptiles flashed across the highway from the jungle.
They knew they had covered many scores of miles, and yet the road went endlessly on. Then, through the scintillating haze, they glimpsed the outlines of a small black mountain ahead of them.
came closer. Both Futuremen cried out in amazement. It was not a
small mountain that loomed ahead. It was a black structure of
mountainous bulk, rising stupendously from the luminous green forest...
Edmond Hamilton, The Comet Kings (1942)
Hesitation would have been fatal... a path was cleared for him as he moved. One by one, two by two, the Proteans shrank away...
"Chief," a voice said, "they're closing up behind us!"
The wall of the tower loomed just ahead...
As though at a signal, the Proteans roused... The spheres swayed, rocked. Suddenly they poured down on the Earthmen!... The men fired a single, continuous roar of bullets.
from the start it was hopeless. Like the fabled legions of Cadmus, the
Proteans seemed to spring into existence from empty air. Strange
dream-beings, given the attributes of matter and energy by the power of
the black monolith! Dreams made real - living, dangerous...
Arthur K Barnes, Interplanetary Hunter (1956)