Generally speaking, all of the historic churches in the United States have an appearance and plan derived from the cathedrals and chapels in Europe. However, these churches were "Americanized" -- they were built from the local materials, or featured certain detailing popular to the region. In America's Southwest, for example, the mission churches set up by the Spaniards were constructed in the Baroque style, but borrowed an aesthetic -- adobe -- from the local inhabitants.
The Gothic and Romanesque Revivals brought forth a wave of churches to small and large towns across the country, many of them sharing similar, Americanized characteristics.
Gothic Revival (~1830 to ~1860)
The Gothic style is most easily identified by its pointed arch, found on windows and doors. Other characteristics of the Gothic Revival style are trifoils and quatrefoils, tracery windows, rose windows, and steeply-pitched roofs. In Europe, the Gothic Revival heralded grand cathedrals and mansions, while in America, the buildings were usually downsized to a more humble scale. The style was used not only for churches, but for houses, cottages, university buildings, and the occasional American castle. Instead of having two steeples like their larger European counterparts, the smaller churches in the United States often had only one. Construction materials ranged from brick to stone to whitewashed clapboard, but the overall Gothic aesthetic was always recognizable. (There are, of course, many exceptions: larger cities became home to Gothic Revival cathedrals of grand scale; St. Patrick's Cathedral in New York City and the cathedrals that line the streets of Detroit are some examples.)

A Gothic Revival Catholic church in Hillsdale.

A tiny church in Harbor Springs -- though it is much simpler and built from whitewashed clapboard, it still exhibits the Gothic arch.
Romanesque Revival (~1840 - ~1900)
At the same time that the Gothic Revival came to be popular, the Romanesque Revival did, as well. The Romanesque style is identified by its rounded arches -- semicircular arches above windows and doors. Buildings often had two towers of differing heights, covered with different roofing styles. The Romanesque Revival was used most commonly for churches and public buildings.

The First Congregational Church in Jackson. Note the rounded arches and unique towers.

Saline's Presbyterian Church was built in 1898.
Michigan is extremely lucky to have such unique and beautiful county courthouses. In other parts of the United States, the original structures are often demolished and replaced with ugly, box-like buildings, but the county seats of Michigan seem to have a reverence for their historic courthouses. Sometimes, the buildings are restored and used not for government purposes, but as museums or tourist centers. In the case of the Muskegon County Courthouse, the building -- an imposing castle-like structure -- has been converted into the base for the local Board of Education.
Whatever their current use may be, Michigan's county courthouses are worth checking out. Most of them have beautiful ornamentation and exterior detail, and some are even adorned with mascarons or other gargoyle-ish figures. A common feature is a cupola or dome, though there are several exceptions throughout the state.

The solidly-built Muskegon County Courthouse in Muskegon.

The recently-restored Eaton County Courthouse in Charlotte. It was built in 1883.

The Lenawee County Courthouse in Adrian.

Built in 1904, the Ingham County Courthouse in Mason was added to the National Register of Historic Places in 1971.

The beautiful Chippewa County Courthouse in Sault Ste. Marie was built in 1877 and is also listed on the National Register of Historic Places.

The Van Buren County Courthouse in Paw Paw, built in 1901. This building has some fantastic ornamentation.

Traverse City's Grand Traverse County Courthouse, built in 1900, is a very plain structure free of almost all exterior ornamentation.

The Hillsdale County Courthouse in Hillsdale -- quite similar to the Van Buren County Courthouse.
Of course, there are many more lovely courthouses in this state, and as I continue to explore Michigan, I'll be sure to visit the county seats and photograph their courthouses.
I'd also like to congratulate the Detroit Tigers for their champagne-soaked series victory over the New York Yankees!