Photograph at the center point of the construction for the Tower of the Americas, San Antonio, Texas. Marshall T. Steves, Sr. & John White with hard hats on shake hands at the base point of the Tower. Behind them a construction worker sits in the driver's seat of a bulldozer.

Hemisfair model with “Viva Hemisfair” prop for the 1968 World's Fair known as HemisFair '68, held from April to October 1968 in San Antonio.

Image of downtown street renovation.

Image of a model of Los Voladores, Flying Indians from Mexico at the 1968 World's Fair known as HemisFair '68, held from April to October 1968 in San Antonio.

Image of a model of the LIDO building at the 1968 World's Fair known as HemisFair '68, held from April to October 1968 in San Antonio.

Image of a model of Los Voladores, Flying Indians from Mexico for the 1968 World's Fair known as HemisFair '68, held from April to October 1968 in San Antonio.

Image of a model of Los Voladores, Flying Indians from Mexico for the 1968 World's Fair known as HemisFair '68, held from April to October 1968 in San Antonio.

Image of a model of Los Voladores, Flying Indians from Mexico for the 1968 World's Fair known as HemisFair '68, held from April to October 1968 in San Antonio.

Pincus and Hardy stores at intersection off Broadway.

Image of flags of various countries lining Broadway St. near the San Antonio Light Newspaper.

Image of Broadway and Jones before street renovations.

Image of flags of the various countries lined on Broadway St. at the 1968 World's Fair known as HemisFair '68, held from April to October 1968 in San Antonio, Texas.

Image of downtown Broadway St. lined with flags of various countries. More than twenty countries participated in HemisFair '68 and had pavilions.

Image of flags lining Broadway and Jones Street.

Image of a model of the IBM Pavilion at the 1968 World's Fair known as HemisFair '68, held from April to October 1968 in San Antonio, Texas.

Image of a model of the IBM Pavilion at the 1968 World's Fair known as HemisFair '68, held from April to October 1968 in San Antonio, Texas.

6 graphic advertisements for HemisFair '68. The two largest ones show the Tower of the Americas, amusement rides and people visiting some of the cultural exhibits. The text on all of the advertisements says "Visit HemisFair 1968 World's Fair, San Antonio, Tex. Apr 6-Oct 6, '68".

Six graphic advertisements for HemisFair '68. The two largest show a group of Latin dancers and a Punch and Judy puppet show. The text on all of the advertisements says "Visit HemisFair 1968 World's Fair, San Antonio, Tex. Apr 6-Oct 6, '68".

Two union workers picketing at the HemisFair construction site. One of them holds a sign that reads 'This job is unsafe'.

The souvenir book for HemisFair '68. The contents includes information about the countries participating, corporate and industrial exhibits, amusements, and food. The Tower of the Americas dominates the cover illustration.

Exhibit hall with brightly colored exterior walls, one red with a geometric sun, one orange and one blue with a light blue crescent moon with a face, described on the back as the "El Encanto de un Pueblo / The Magic of a People" theme exhibit. This is where the Alexander Girard Foundation collection of folk art, with over 10,000 pieces of Latin American folk art was exhibited. The mini-monorail can be seen just at the right edge.

Image of downtown Broadway St. at the corner of Pincus and Hardy stores.

Photograph of the HemisFair construction site dominated by the shaft of the Tower of the Americas. The tower's tophouse has not yet been put in place. In front of the tower, two carriages of the Swiss Skyride can be seen.

Photograph of Marshall T. Steves, Sr. and John White standing inside the construction hole of the Tower of Americas, San Antonio, Texas.