Name that circular tower!

Opened in 1972, this tower has gone by many different names, but today is officially known as the JenTower. However, many locals refer to it by one of its many nicknames, including Keksrolle, and the Henselmann tower, after the building's architect, Hermann Henselmann.

This is the third-tallest all-hotel building in the Western Hemisphere, the tallest building in Detroit, and the tallest of seven skyscrapers that make up the Renaissance Center Complex, home to General Motors.

Named after Canadian-Israeli real estate developer David Azrieli, this glorious tower is one of three that make up the Azrieli Center, a mixed-use complex with offices, a shopping mall and many other amenities.

These two circular towers (corncob-shaped, to be exact) were completed in 1964, and at the time were the tallest residential buildings in the world.

Within throwing distance of the Kremlin and Red Square, this hotel is among the tallest buildings in Moscow. Completed in 2005, it's earned accolades for its contemporary design.

One of the most iconic buildings in the City of Angels, the Capital Records building was completed in 1956. Interesting fact: A blinking light atop the tower spells out the word "Hollywood" in Morse code.

The second-tallest all-hotel skyscraper in the Western Hemisphere, it's easy to get a sense of just how high this building goes by taking a ride on the elevator located on the outside of the building.