Home to the massive congregation of preacher Robert Schuller, famous for the Hour of Power television show, this 1981 cathedral certainly puts the mega in megachurch. Technically a tower of glass, the $18 million structure designed by Philip Johnson utilizes silicon-based glue to hold the 10,000 glass panes in place. In 2019, the postmodern ecclesiastical structure reopened after a renovation by the Catholic church, which purchased the space after Schuller went bankrupt.