A modular tower structure, comprising: a plurality of sections, the sections comprise a plurality of panels; the panels comprising a curved or arcuate shape, the panels comprising vertical edges and horizontal edges; a vertical connection to connect or secure the panels at the vertical edges of the panels and form the sections, wherein the sections have a generally circular shape; the vertical connection (200, 201) comprising an interior vertical friction plate positioned over a seam between adjacent panels and an exterior vertical friction plate positioned over the seam between the adjacent panels, wherein the vertical connection (200, 201) is configured to be tightened from an inside of the modular tower; and a horizontal connection to connect or secure the sections at the horizontal edges of the panels; the horizontal connection comprising an interior friction plate that covers a seam between the adjacent sections, and an exterior friction plate that covers the seam between the adjacent sections, wherein the horizontal connection is configured to be tightened from an inside of the modular tower; and, wherein the panels comprise a plurality of holes bored therethrough along the vertical edges of the panels, a threaded stud passes through the holes such that a first end of the threaded stud is on an interior side of the panel and a second end of the threaded stud is on an exterior side of the panel, the interior and exterior vertical friction plates (231, 230) comprise a plurality of holes in two oppositely disposed sets (234, 236) corresponding to the holes in the panel and are installed on the threaded studs on both the interior and the exterior sides of the panel, wherein a flange nut on the exterior side of the panel receives the stud, and an anti-rotation nut tab is placed over a flange nut on the exterior side of the panel, and the anti-rotation nut tab prevents the tightened flange nut from loosening as an extending end of the anti-rotation nut tab contacts an adjacent flange nut, and wherein the plurality of sections are stacked on each other and the adjacent sections are connected or secured together by the horizontal connection. a plurality of sections, the sections comprise a plurality of panels; the panels comprising a curved or arcuate shape, the panels comprising vertical edges and horizontal edges; a vertical connection to connect or secure the panels at the vertical edges of the panels and form the sections, wherein the sections have a generally circular shape; the vertical connection (200, 201) comprising an interior vertical friction plate positioned over a seam between adjacent panels and an exterior vertical friction plate positioned over the seam between the adjacent panels, wherein the vertical connection (200, 201) is configured to be tightened from an inside of the modular tower; and a horizontal connection to connect or secure the sections at the horizontal edges of the panels; the horizontal connection comprising an interior friction plate that covers a seam between the adjacent sections, and an exterior friction plate that covers the seam between the adjacent sections, wherein the horizontal connection is configured to be tightened from an inside of the modular tower; and, wherein the panels comprise a plurality of holes bored therethrough along the vertical edges of the panels, a threaded stud passes through the holes such that a first end of the threaded stud is on an interior side of the panel and a second end of the threaded stud is on an exterior side of the panel, the interior and exterior vertical friction plates (231, 230) comprise a plurality of holes in two oppositely disposed sets (234, 236) corresponding to the holes in the panel and are installed on the threaded studs on both the interior and the exterior sides of the panel, wherein a flange nut on the exterior side of the panel receives the stud, and an anti-rotation nut tab is placed over a flange nut on the exterior side of the panel, and the anti-rotation nut tab prevents the tightened flange nut from loosening as an extending end of the anti-rotation nut tab contacts an adjacent flange nut, and wherein the plurality of sections are stacked on each other and the adjacent sections are connected or secured together by the horizontal connection.