The Internet Archive discovers and captures web pages through many different web crawls.
At any given time several distinct crawls are running, some for months, and some every day or longer.
View the web archive through the Wayback Machine.
A quick-moving rain storm had just passed, and the color photographers were shooting the gorgeous rainbow in the background. They got the rainbow, but missed the impact of black/white.
These rocks in Arches evoke formations in Arches evoke a feeling of large city skyscrapers, so the formation is called Park Avenue, as in New York City.