It was beautiful that day, I wish I could be stuck there forever..

Special masonry chisels with or without wide blades and power tools with appropriate blades. Check out Amazon under brick cutting.

Well at this place there’s like 4 of those fancy circle thingies and I have no idea how they made them

Start out with a larger than half-circle high opening in a half high wall. Bottom half circle, 3 o'clock through 9 o'clock, is easy-just lay them upward from 6 o'clock using a half-circle template to ensure their proper placement. Top half circle involves using a properly shaped and braced wooden form that the bricks are layed on. The rest of the wall is built to enclose the upper half circle of bricks. The support is then removed.